{
  "manageEntity": {
    "action": "Save",
    "entityId": "1387212639",
    "entityType": "Track",
    "nonce": "0x2a61e04a9a28f53210743955df763f639ff2d4f38e830d37c40a50e7b3ee61b7",
    "signature": "0x5c646192b25904575f6a91509e4d1af9f6a80c06709919ed8d11a191b28516fa0bfa5e1e431a71db6ceff5d220f460d8cc1144d67e89e45e2033c218ab5d1e0a1b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}