{
  "manageEntity": {
    "action": "Save",
    "entityId": "908749160",
    "entityType": "Track",
    "nonce": "0x6171620704d907b8da9b467d844e56e42d7581707d5c1342fe5a01d1073b1af7",
    "signature": "0x284f98d08ef88eac8d9144bdf675f426f0ee8e2e5b138b778a4e572ff5be8ec229220ff2c2fa00342b66dc4c14034c76a7c5971ba0fe8e73bee04d2e3735691f1c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}