{
  "manageEntity": {
    "action": "Save",
    "entityId": "471171689",
    "entityType": "Track",
    "nonce": "0xb2a2dde48b340c32d6c65039435b647bb1031bea1e729d1cebdaaaf476c06706",
    "signature": "0xf62dca94562487a170434b26457eef6f9e92052ce9de56ed1e89d2ed45ad1cbb7eef3b329eadf761db2053018faeb2cd2f12be1d9b261983b833933bdabd28b71b",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}