{
  "manageEntity": {
    "action": "Save",
    "entityId": "1898850169",
    "entityType": "Track",
    "nonce": "0x737ff64144351af0fac77d397ef9a16b192b88a57b4303149675a0f2517bb263",
    "signature": "0x94c567ac254d800f173f616c3b6c22ae085f755ab45904a9d224211b0731a02908d165a9ee321b348d79868dcb43696b5711efaa40dd0722fff30ab804e3f7a71c",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}