{
  "manageEntity": {
    "action": "Save",
    "entityId": "197763546",
    "entityType": "Track",
    "nonce": "0x87fb15e76807d306017b35ec8da1916dd526d4adbcb218957ea20c429a95a762",
    "signature": "0xacdea1c9825b1a76b475d7fae15f0ad6825a626cceb641afe18fa7003a515fe225cb6d93d0e55e662a4f01a924e5d536bb1fce456b3dd2607b48f0eb1f5ca8ea1c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}