{
  "manageEntity": {
    "action": "Save",
    "entityId": "492526713",
    "entityType": "Track",
    "nonce": "0x55f98a8c58e6dbc84a5722da25e66720932f91b5755ed03c124aac681bd2b8e8",
    "signature": "0x888429dd3f9178833216c6b1220e731e32c9fc16da1c6716de52be6aea95f57726d73630f3bacb637bb7bbd9235c4f2fda669bf1c129b58b7be02858c45b8add1b",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}