{
  "manageEntity": {
    "action": "Save",
    "entityId": "404482011",
    "entityType": "Track",
    "nonce": "0x186e651a966aecd3cdfca4d478ba62b6d139ee325e0575baa697dc0e7da4e713",
    "signature": "0x35b11566dc3d7ac8aa93335fca99d163c7a88e5943437612e75e0070e985ad0474559d056afd4ea248b2a13a9c442bad555745c424a1331fd1e349280b2179261b",
    "signer": "0xD967b68365738013c9197659aAb46EB73a488080",
    "userId": "488430169"
  }
}