{
  "manageEntity": {
    "action": "Save",
    "entityId": "1807402723",
    "entityType": "Track",
    "nonce": "0x3e001dcfa33ecc4afbf7caee9399f46e3dbacb42997dfac06d36a506c0e44210",
    "signature": "0x6368078954a3c1325d4b17adff194288861a204680d27f044e80bf866cc4f6132e7db9c8d580fd230c682d3d030ec09b3a4fe1b0786e768837bbce609a2c25331c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}