{
  "manageEntity": {
    "action": "Save",
    "entityId": "912759735",
    "entityType": "Track",
    "nonce": "0x693af3281f3ee409c5ac445b07a41b7826c5265050acbb15ab6a4f37bf40a326",
    "signature": "0x66c82981ab29af2971154b0b61d7123aed3d10c858969b3a6483d1c2a7da0a6e1baf87a5660bd793469def8f0243d8232ff030b8aad393c0225476fbd662c6ec1c",
    "signer": "0xb6B208a8f79b1D88d245afa5aDB0a40d38cd6DD1",
    "userId": "528688046"
  }
}