{
  "manageEntity": {
    "action": "Save",
    "entityId": "1900901343",
    "entityType": "Track",
    "nonce": "0xf24c2d36ed694aeeb7c718a474467640976f3ccfd4b5dbbacd9ac26fa5be8f1f",
    "signature": "0x9f72fe25f1cef311bc9b5697fb6c36eabbfbbe74115ec181d36416c6082df04d73d7df140dce07e7af2a0eb80f0f0e2663146687e38632a6a2bfd1a2dca13e041c",
    "signer": "0x4D8EDeF47b57f98c89BDFf851267B0327BE4cD05",
    "userId": "5307724"
  }
}