{
  "manageEntity": {
    "action": "Save",
    "entityId": "603032",
    "entityType": "Track",
    "nonce": "0x3f5099a2482333c57d1bdd789638be68e1220f0c26ec37e09873573fa176fe06",
    "signature": "0x374dc6d00488ce215b125c9f4e3c7b5eddb6510eb5316ef541ec8bb788ee39d05c9e6945eba0b055b1e34b40f519b5268d189bfafd7fea3af2267fb4648ea6ed1b",
    "signer": "0xbbB98413eB671bb0000F0b18A2A7Cae9631043E1",
    "userId": "98311147"
  }
}