{
  "manageEntity": {
    "action": "Save",
    "entityId": "685754559",
    "entityType": "Track",
    "nonce": "0x791c5ecc3c0ed259d152d61922e8e609b764e0eb7004fdab103d6bd84f0f1993",
    "signature": "0xff8f00a9f36eb101cd01d8fb468517f8256912eba1b302df25ba034c303901a50976ad634b6ffd2b7e938e7a5c9f19e667b86ea1f1e8ec31af8ac433310b93eb1b",
    "signer": "0x5D012C880480A2E1ab4345f6F374CFf73e040331",
    "userId": "10449019"
  }
}