{
  "manageEntity": {
    "action": "Save",
    "entityId": "447947281",
    "entityType": "Track",
    "nonce": "0xe23eece3382a538f7ac8d01b4905941ca0979fc1082068d7a0ad8fd7096af932",
    "signature": "0x171a38cb54572ad8de3f47fd190569a5c6626cbc408db767a0477b0428cd189a0a8505c0d68df03112988a401ac0e455cc9dea0c7d96102980f45cd883f9ad501b",
    "signer": "0x7eBAab495a64FAea1f04dc59ff804bf939da7B12",
    "userId": "709077025"
  }
}