{
  "manageEntity": {
    "action": "Save",
    "entityId": "521978499",
    "entityType": "Track",
    "nonce": "0x14d9539df87af230d45bd1703070b48e0777956e96e5eca092b3d0b4e4c81964",
    "signature": "0x50da16e9e5e371236d8200bfd8318dd298c2c1dc8e6dd7cb18b13345a127f3253026d229b00e51907e5673bd3b2f4d553fa1fb9a91265cedb28d01b733d132d71b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}