{
  "manageEntity": {
    "action": "Save",
    "entityId": "520834674",
    "entityType": "Track",
    "nonce": "0x9ae24e4ca06b8baa029c7c3966e8bfb05d724be5af0a38dcfd14760789fa0319",
    "signature": "0xdfd9b51c39ccf7a434960a63594fc18fee0dd89fe55d2ca848ea46464aa3dd16418741f4de1af8927b1052f86512afe9bfeef751ce6681f850098c2684e5cfbb1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}