{
  "manageEntity": {
    "action": "Save",
    "entityId": "416357535",
    "entityType": "Track",
    "nonce": "0xf4f2235e73a4c8c4cba4370007f50532f8976b1268c6fbb0b897137c8c5d4a29",
    "signature": "0x89ce465db2176992c8714146226c2820cb348861e7a3ed32b4b330c7f51ce0bb19a94fd8c64627ad3f75fdd7c73ba213054666558f761b7efb446cab584ad6d81b",
    "signer": "0x712Aca9aA6ac07F98dcEC338Be9C15c3Dc47d569",
    "userId": "12730129"
  }
}