{
  "manageEntity": {
    "action": "Save",
    "entityId": "440488775",
    "entityType": "Track",
    "nonce": "0x9524c6634bb5ed45a70b2ce3fba24f56cfd6474ee1948638216abad03648c58c",
    "signature": "0xec3a600d9b06c3acaeed7ec2026e23874c304dda7c9b01ce7774fba24485066a7807ddba9f75984c8aad3612c8e1e2decb0f76df9a6a27915e042fb2a4d60fa11c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}