{
  "manageEntity": {
    "action": "Save",
    "entityId": "307442",
    "entityType": "Track",
    "nonce": "0x4264f00f51bf93ec1de31dd90e5a72039c416cf5e318eb74dda1efce57621daa",
    "signature": "0x5262c9a05b36db9da21d24d38fcba7e29ac4b57d681c94231dad36285cd55ef8261d9931ebe0c996d5ccde0aa30c5ebbea50c755a793c7fac15a9daa73f9a8501b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}