Max (Maximilian) David (7 December 1859 in Starý Jičín – ?) was a Moravian-German engineer. David graduated from Technical College in Brno, which he attended twice – from 1877 to 1879 and then from 1
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f18f6f64060d776171bd2ae0fad6a6fa657d5a7faf2a1b2f2d9636a32295264. 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/4d6bf2db-9a2d-4ac7-adb2-c2d03f7b3533.json and https://artists.proofprofile.net/proofs/artist/4d6bf2db-9a2d-4ac7-adb2-c2d03f7b3533.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Kontor Sports - Nonstop Powermix, 2020.03
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe1afdcbf94b28eaba5c10d1a39c09233a623a5157f92f7381a2c287edf6b7da. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEN062003116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x714a9658c686b88ab18d50bab735647d3195786ac6c6f351cb52c0599083cfca. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/DEN062003113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe94a2a0a4b4df6578bb78613de89a727979ff91a90bab09271430dde27479b39. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEVT81900170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd16d1b6d2bd4c126f2f3aa983cba0809f627a80395a66379bb4c57fed355c4f4. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEVT81900174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0470d2613c95f456e02fedad2ab6ff65e45ba5bcc5f443068b4b9529d1666dbd. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEVT81900172.
Breaking Free - High School Extended Mix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4696bfa045b6ed3f900c853e73f14bc01a6c6f1885801a646514a01e6d0fba89. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEVT81900171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a7e458ce06c629ca2ce4bc85b2d86bea51adba880ce5bc76c7f4b86595a47c5. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/DEVT81900175.
Breaking Free - Phatt Lenny Extended Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe45339c518c298c8d3fea1edeb80bc809ccdd483c65970e230d8368b6b818775. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/DEVT81900173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad11955f81157be419c417405fd0eff5ba45a82ec6252baa41ed2b8861baf181. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEN061900001.