{
  "manageEntity": {
    "action": "Save",
    "entityId": "457847631",
    "entityType": "Track",
    "nonce": "0x9661b52d36a974b286163d8e5246adcba3c786774e52bd0524763ab92bb32e1b",
    "signature": "0x0ad1416fa94598bed04b54b9a38ada525f6ddeb3210796b88c62442eca5b1ba24c2ab43d98f07d529cf3345243f27c120c6c123c108a9b3871d07995c1e64e591c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}