{
  "manageEntity": {
    "action": "Save",
    "entityId": "548947448",
    "entityType": "Track",
    "nonce": "0x2df775fd103990cfac3ecae38607f5c203a429bd9d3c630578307f957a7785a1",
    "signature": "0xd70f2d78ca7d1d11fa78483ad46a6645bbdc032744e04f07b0d54165e163c3e71c205a7d2e50b83e7cf6a2ddfaf22901d641ed3421e1f61e08a51f3ea24012d41b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}