Zachary David (born 14 August 2007) is a Filipino racing driver who competes in Super Formula Lights for B-Max and part-time in the Formula Regional European Championship for CL Motorsport. David liv
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6484e071ff7fa5d9ae669176346c934fb12e7bc2d032066e49cd2486f75c06e. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b7655c80-5df2-45b3-b31c-53e05a987c7c.json and https://artists.proofprofile.net/proofs/artist/b7655c80-5df2-45b3-b31c-53e05a987c7c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed99adf58ea7a5f36d03108129e0ec78be7c909166d02e1504f6e2be18555894. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM81784363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69d22131b380f0fc14d7cf174928f362be9d136b7a4cef6094373a068625bc69. Chain 2 (Bitcoin): anchored in block 958945 (2026-07-21T03:25:02Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAFF2075433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8262832c7992528982561436fe8dbf4b1504fa3d54c2357a8368453b6a6a7b0e. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAFH2073429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05ba67ecbe0ab4b5bea5dbb1a0685617eb234b56aa369618765efeacf26fd60c. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T13:50:42Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAFJ2191854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa97f52e752cfe9cd9dc1e18fb0b686f9967861fc076790e5cfd565d761094498. Chain 2 (Bitcoin): anchored in block 958680 (2026-07-19T06:04:14Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZN882234066.