{
  "manageEntity": {
    "action": "Save",
    "entityId": "676709",
    "entityType": "Track",
    "nonce": "0x992c447b1a6de6440a0108e6dd120f0a3f1f02cac2d8fede2ac1e60db0549494",
    "signature": "0x7b628ec0769a34268c704c3fd3f0478fe867477c7677f5755de1148b8097846b25a3a2d924c7662f1a4d4864e73646a3159cc4600305e62d2454ac7a4f2140641c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}