{
  "manageEntity": {
    "action": "Save",
    "entityId": "1564960262",
    "entityType": "Track",
    "nonce": "0x22a24083c98f712453d6bc79b83666c631a9cf26784cbd9c2797365c004c8f7f",
    "signature": "0xbba1c8c19984f02412ef222b6d44deb2026e45f61c5de5f559d2a62a7cafa0b3466a9d0e3fd5e0904d3dc7f64b983386da6dd32c9565bd54eaeb3f96ed1ec0dd1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}