{
  "manageEntity": {
    "action": "Save",
    "entityId": "685733863",
    "entityType": "Track",
    "nonce": "0x9f5bddc9e16231f2219c3a0c9ac3f25ddad1f58c10c59a14738c7c2d4b07c136",
    "signature": "0x5c3ba165f5c58dd12109873773419c22447d9be2425288fbeed9011e31118086301eebc35862da48b89f79f3fd9d063c6e04a971b66a8152133d8014ae7f17871c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}