{
  "manageEntity": {
    "action": "Save",
    "entityId": "1977912622",
    "entityType": "Track",
    "nonce": "0x55dda7e96f879a3af4345ea8ff235275957b23072c8b8f2a8a8971556727a2c0",
    "signature": "0xd449fc2e64ef6a8847f98f6b410109162d0822a1562b8093691830ccfe63c6800a73069eab7ae0fae9444fb8011d80545e08e0d20dba40df0126b44e95a577931b",
    "signer": "0xc397C4709687C73dfCC135CDC077A82066147CFA",
    "userId": "552759720"
  }
}