{
  "manageEntity": {
    "action": "Save",
    "entityId": "782879865",
    "entityType": "Track",
    "nonce": "0xec1b6d30c1ee584e693c75bc2b47978c187bd8f22b373d9a0347e4f8925ec36c",
    "signature": "0xfd80a18f8622e2a1aa37eb135be63af6e65b64000738a8252fcd1b4993d905ba324320d62878a230fcfb84789923c57a80617279a598942d0a94b13e65a9fb821c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}