{
  "manageEntity": {
    "action": "Save",
    "entityId": "668572069",
    "entityType": "Track",
    "nonce": "0x459106b825687dbc737ce06d60b024ba43c495a1cea0afad52a46a3e66316830",
    "signature": "0xc9fda9054341272109d9dc2e27d4901c6432ea9b1998d68693a75ffc4c3a376a38dca08cf06fecc9c4d73af1f3287dd61f492bbf42be2b0dd7417b590285009e1c",
    "signer": "0x9436FA87F6c8C3aa9e0F0fc7960566dEeB9e23d4",
    "userId": "2047015"
  }
}