{
  "manageEntity": {
    "action": "Save",
    "entityId": "1546577104",
    "entityType": "Track",
    "nonce": "0x6ca44f1688a0b99ea351e287a3ee019d529a058ba3baad040571c128fe8c2f19",
    "signature": "0x276ab7775afaf3ef44c26f469372e936b542ed67b7cb05ebdb5df8475250296a45b10b7b29f06b4995ebf537bed0f46b8ac244740e89604651cbe1bdd677f2e11c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}