{
  "manageEntity": {
    "action": "Save",
    "entityId": "1557157227",
    "entityType": "Track",
    "nonce": "0xd1c01eacbdf0b8f09830cb299dd2eabd76ec69712264b6422698eb6fb6ee9b05",
    "signature": "0x368a50fffb4a2ff446229449f17aa3c114206884017a9b5d3c163b502cad4054496d364e274a4533c38fd1cf6f8a2c744b57f36d96481dbbee6e071bd2567b311b",
    "signer": "0x0b901AE3Eb7b439095858D82Ff194CfeD0Fd3396",
    "userId": "167557"
  }
}