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 0x2cc748a01c6e54466a4d862192964bc992779a6673b108035282cf105889d4fb. 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/df621577-158a-42bf-af37-6cff0b6b63ac.json and https://artists.proofprofile.net/proofs/artist/df621577-158a-42bf-af37-6cff0b6b63ac.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 0x17bbd66e38a7416632c44730c50197bc89f64f2eeff02745fb91267704f50d29. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/TCJPD2413240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d354f6d43a85688d4014b0ec6471eb7f64856b95d8d2b3481cc7159ad2e816e. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/TCJPD2413241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc3aff32c398e2b483290095aa4b063710923b6f93f158bf0d70d3a2b3340d8c. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/TCJPD2413246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35f1ae4633c0497be2d851c047e2774df88bda091f4f15fda7b4bff53ff14987. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/TCJPD2413248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4364193b9664421d5e2a2ef5bc0abc6dbcd1697968ab9299ee0fba0ad0c677a. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCJPD2413249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91614d36a5d9c7cfc2b378ea7db4364a80822be8964023e3ede8dc0f29cf2d14. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/TCJPD2593845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13f3e5f596701855b75b791d0c6c9a8022a2f957174446e5ffd7cb57b3b9e979. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/TCJPD2593846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff70923f57c0b800232556e88ddf20ab78583d4dbbbe768d58b1892482a34e95. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/TCJPD2593847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x292d4e19c1fbb91bb80c775f882ae564ca3acd6a8b2ee342682c0935b6c5cc63. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/TCJPD2593864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa0724314e8169079ae9b5af582d71e6c723ba8e962daf59d14b9e5ad1555201. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TCJPD2593860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48a480d87406728818a8dd14af72a79c1d836aa726272ee00a5f6ee2eb5988ac. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/JP92S2539223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6da5e62381c0437091db8ce12f7596f7d83b9cb872f84a22573084446f84e275. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/JP92S2539209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2145577286668b987bacbf69207100fcd6e904024b3a5bb5583c32ff4f399649. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/JP92S2539183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8dae40036c6e634fdaf9175b8e3ad90de30dcb00d62e53e68c79dae14db831e. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/JP92S2539186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x563d1988e3ad3257601fbdf334b61a7ce6d922599544d9a39831a2d5dd139bfb. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/JP92S2539179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02487799643664ef6d9b1e68cf87a8c7a2692f7bb2a0049bbe53a020af2676cf. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/JP92S2539175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4f3be2e3d39281447e3151d07ba2bf24c64ffbb51d20692d3bc16c3c6cf5f8c. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/CAGOO2556231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6cbf1afa46626c595028ade8ed1e58b2db7b7551e3a5ae783ef3da95eb79165. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/CAGOO2556228.