{
  "manageEntity": {
    "action": "Save",
    "entityId": "580990",
    "entityType": "Track",
    "nonce": "0x38c50b283513d090ae0a163f513811fad17fa7d7e15ac38de9b22919b0fb5a15",
    "signature": "0xec70077ac30538127603dbe433c0c6feb58e47c6dd9ca6da6eab621508877c9f0f55ba75e5f8252a7d00773eab07ba2090ba2c5fb1c9c76826e187d6137285bc1b",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}