{
  "manageEntity": {
    "action": "Save",
    "entityId": "28775",
    "entityType": "Track",
    "nonce": "0x5b259d5a8a6aa30aed77152657a3cc23dfc39ea3853c6ab652358e279feaf132",
    "signature": "0x10d5e4037719b8e4f0e638af0f4cf5ad81ed5f271bdec7d295359ba0082088fc16302a1d0e4f30a79c212fa971d0ce156ee8971062052057bc55623fc9c2be071b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}