{
  "manageEntity": {
    "action": "Save",
    "entityId": "660668210",
    "entityType": "Track",
    "nonce": "0xadd58ef06348eded7bff84f92aec936f720b8ccd45050ca3bd522ce58b7f0e7f",
    "signature": "0xb2f5ca8a270052f55370068accd32fbd08cb0ae9c5c5f14f9eedab95ceeb44ef6bc92833393501e4c11c3d787270f51040855e0fabdd00758fb747eec29fed3e1c",
    "signer": "0xF3330D57E4B0Bc146AAF60F1B334C3b1A34330AA",
    "userId": "530760555"
  }
}