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 0x6f9136e267a326f586ceccc22dd6718c1ae467b512aeabe61ffba20eda164a16. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cd741684-0b43-4257-b5e8-61dbbc255467.json and https://artists.proofprofile.net/proofs/artist/cd741684-0b43-4257-b5e8-61dbbc255467.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 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 0x6e45d846f7c7fd9198e0efc785201499fc66412769e6b722a9a81e6185769e47. 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/TCAIM2483017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa501d331d287a388c73689409b5162ba524af32ff44941eb7f6451476e1f38de. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/GBLLT2256468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe81d90b31041fc854258bcaea88c63d03e9a4113745ee545426a23a99cbdfdc8. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZMER2142296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x380595cc3981baec770cdfb3ce5b74160097a7cc4448fce49ff471f1e653031a. 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/US3DF2000905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe914c08eb0bb8c10796e8d2c607a3c5c16a35e9d070386ccd5f07572888bc908. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/QZFZ42033622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce8aa0a5a1b54a0cccd72a7b51041133f4fd677d47ee7a5968b6248563ea3a7f. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/NLZ2D2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9afc8efafc575f0979a22c87139a364ae2e47446631329d8dafff6dffe95d2a. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/NL1MZ2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbe5b982daaecf19ef981f470d44bf75f01685886ff9e74efed8073f7c7ebb25. 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/NL1MZ2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe553d515affc2fcdf9d43ca23728ccd0d9abaafb24fa5cc0d14a25e2ce2b3e3c. 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/NL1MZ2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdca0736d7ed07755e1907e98ee7b1f08bf5981c71c2a690c2031bdaaa5e32b17. 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/NL1MZ2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38781d8191f687f22ffc9544697c9cdb5f5b01b98e52580b35db8b2b08fb9261. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/NL1MZ2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f49b32a3647e9f5003830f7ad952d2cac794f509ff5fc016e886028f76cca6f. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/NL1MZ2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41d63da1af90af5face9505069fa6b7be8e1b8621559f5e8ef919c20797c1815. 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/NL1MZ2300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd55adf44b003ef62fdce7cff9025272216b09c7561c4f17a8ba28dddb468e225. 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/NL1MZ2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aa7d26c57df5132f6d0ab0b1d6a2f9c6cc7dc23d4cdc66d8d98a287e39de53f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NL1MZ2300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcee01bfcf094dca6911202b0396683eeb891c5918f4c84e71d12f8b37aaf7a1. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/NL1MZ2300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec9d0fe8c8ae43a00fa383fb0acf49ed262821cf9dc36707d8b946b4a12079ac. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NL1MZ2300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85a73c85a43b9fa24be16406b7b63223df1919f2543b0f888115d08fa5919aec. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/NL1MZ2300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33f8733e7eb8b33514b7246455d7d38c164685228bccf38138129718a427af40. 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/NL1MZ2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66397044197f06eb55d3e04d928376f57b350d6f6f6d561064b6ebdabebedc4c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NL1MZ2300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeccd6a132c04347391ee10ccee25479cf15888a713ee440d7b6f680d7fa1713c. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZV362221056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78484ffed82f4f956247b80d7c2e8cb4a267ab1c13c2e5bf181cae6f2d66d802. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZV362221057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3291a1ac704168c935acdfd0ab186c8edb799859020e24357886ee0dc53b5884. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/QZV362221058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x728ae0a1b011ec6683a993f5f5183b0e879a149510815cf3397d2dd13104626b. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/QZV362221059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f5c0054088a2f6cbcd3ed061a83e8b9ce67ee8373d4ac751dbbe32f8ffe7624. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/NLF6H1700081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ea7f61a673fc7af327a9edf10e0c65f13a4fe01c5180436489e6de6ce032b27. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QMG492204962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd230222e7adc5a6abad632fd8e9de95269d4fe7af931b08d41d817ee5cc35242. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QMG492204961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e61985f7b48f199440a65b1b661b5535049da8426ae5d6c9eca9e6546c12ce2. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/TCAIT2437839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x531961f2d69419f4565d3b46bb98800896a589a0ca539c42423739e55df904a7. 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/NLZ2D2000011.