{
  "manageEntity": {
    "action": "Save",
    "entityId": "679440563",
    "entityType": "Track",
    "nonce": "0x2f7750c02665c02ab0014e3ae2348cbee9a499ffe863424526544f125026434c",
    "signature": "0x8af5df2b76114fcae64e9af9a3ec1b4598e5937dc23736ecaf754365c12b60b96dcdb4c8fcd3ac3d69f5a5c6e64cc76405ff8128cdbd7a9da838887f0ed5166d1b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}