{
  "manageEntity": {
    "action": "Save",
    "entityId": "687400410",
    "entityType": "Track",
    "nonce": "0x54e6773cf3460ee1b579c71773cfff632c9ee069ac362c64f722bc11a29b92f9",
    "signature": "0x1c67926747d6db5a0cc4ebd12bac8da8672d9b3e7f1032d5e55fec24a9e443e65505bddb7a545aa2a72c474392cb280dd62f3a37b721ec207c6ba7a4be8f762a1b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}