{
  "manageEntity": {
    "action": "Save",
    "entityId": "2146541610",
    "entityType": "Track",
    "nonce": "0xa3b297fb3aebe706f4208d893bc1c5adbd4ed84aebdc0ceaa0ba70cfabd1f92d",
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    "signer": "0x5D012C880480A2E1ab4345f6F374CFf73e040331",
    "userId": "10449019"
  }
}