{
  "manageEntity": {
    "action": "Save",
    "entityId": "643215143",
    "entityType": "Track",
    "nonce": "0x32eb3840460a016521a300dd0b6d89c2d8b85852887dc2574e10d59e85eb9b73",
    "signature": "0x8f4dfdb942eb3dfdef0152556b6370145ac01a6b65cdc6852aad973b88179b797e64a9f396b1fcdfb8da60505f149a288e86af4f72628a9e525de19d8f48b6231c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}