{
  "manageEntity": {
    "action": "Save",
    "entityId": "1877335085",
    "entityType": "Track",
    "nonce": "0x19308bd4f65b673ab44b14842c1e07ab84edb1d6e7a2c2edbf727a6605d0c842",
    "signature": "0x741131811f233c5a2fdee4187a7b5a47af49a6fbc2df16cf856d74d3d2f8456c1a16d837ae5184317d1765f3b594486c789802d61d2f047cfc39aecd4246acaf1c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}