{
  "manageEntity": {
    "action": "Save",
    "entityId": "660155223",
    "entityType": "Track",
    "nonce": "0x20f7baf29519421cf43976592ec4e6fce224ed03a5025a91956d1ba002823408",
    "signature": "0xcfc84e9c283fec3592363b74717811e199d1770065a3383b3e4c3376136a143228bb1f911925324819e81e1d75fd8efb49769c416b50c29e4e77709a851ed5331b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}