{
  "manageEntity": {
    "action": "Save",
    "entityId": "446474159",
    "entityType": "Track",
    "nonce": "0x1eb773a85b40454426b1859eb2d77dd70d6bcb0aa87a15f593f89fa981848c4d",
    "signature": "0x1fad07db1145300c3a9b91edb3a136cb0d943d4de188abd59ad070aea2fda71444a5e199d203050b5f58fd572754eb6928bd08fc1f34d354e49fe94e32242a871b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}