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 0x8e68bf6b69a118a40c71a7998dbf65bd5876d694ae807ac33e248a6ca03235cf. Chain 2 (Bitcoin): anchored in block 953620 (2026-06-14T09:36:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1e49f561-0aff-45c8-906a-f797398f061a.json and https://artists.proofprofile.net/proofs/artist/1e49f561-0aff-45c8-906a-f797398f061a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Friedrich Hebbel • Lieder von Liebe, Tod und Leidenschaft
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 0x622e6259d20a786ddf86e91103b26da7496c7fa1d5ccac320d6ce6877a60ac41. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DEA302309870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc838ef7420fef6255c5bf3ae27a030b9817c5362291f8ad29d5134bd43f293a5. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DEA302309940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ee21a7b27ae7d9edd758f8a8392f3a3c080fe216b9dff99079af6584166afcf. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/DEA302309950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e7949c470650728822125cba6c1911de8ae67c1fb42d60c082b7a1af98afde4. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/DEA302527810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b8104e0dcecbed0f5fa17b7476b52d8a72776b39831b7e71d1bf12bd4cca512. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/DEA302527820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04f39d404ec23e111bdde9f2621b609ee108aecda55e913a2035b9c77f61ab33. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/DEA302527840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c0cb48283dd490d54ff494057e42617b7f7e47f4ea433579927235a6c2118c2. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/DEA302527850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9533c36d3fbaefc80ac862ca77e19d3eacf30f409f7acc16ef547095fda42e9a. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/DEA302527890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1da7f0c26f82060d6c4b6129e4af8c642f2e36c8ef0aa33f8b25cb85c70517ee. 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/DEA302527920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42487f2910076581e23d3ac864f5f168870061f69560fe155126cbe35b837b19. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/DEA302528010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x543343531d183441f2d7b8297564402529dd612ad98f45b5ccabfaa2a88f1c5c. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/DEA302528020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82c2b51cb9d53f454d7ce491260bc2d8624665fc728b023b81c4883a8f15355f. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/DEA302528030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bde42eaa40b312ba9bf367cb7c74c765e335579eed4c6b59bd7e1596be2e4d4. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/DEA302528050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabc1c57e6fd23ec506001e2095ba4b3f87d64bd6ac5af82691c150f188c0ad71. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/DEA302528080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83a8734d49640bfff091a9705d373c88b906053293a2671a0eab6498c0131125. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/DEA302528100.