{
  "manageEntity": {
    "action": "Save",
    "entityId": "1876574811",
    "entityType": "Track",
    "nonce": "0x363c7b39e0af0a87da17e211fe344f9f612ea57f2f22508a6e05c47b449219a2",
    "signature": "0x1e93d78abe45eaa5408f39a0c6acc07313c8251b38be1fa6ddcb2ac8487bad5028bfc1f55a39fb6feeb87bfac3f47db8fcdd14120ce9afc465360b1cb2a2604e1c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}