{
  "manageEntity": {
    "action": "Save",
    "entityId": "200216146",
    "entityType": "Track",
    "nonce": "0xdac5e1d4eab9d0caeca0b28159499d9727cfa0b5a783dc2be4873f6642360445",
    "signature": "0x143df2d61f1172cd1103f18a21e14cd3f36a63997a7565e06e27476ebbbe01fe2e0a79670291adad84e666db709bbec23160b5ae28f84ff1c30349deca276cd81b",
    "signer": "0x59765b22C96E88dA578af23E8611d6ca2dcCd7C9",
    "userId": "377610060"
  }
}