thumb|Sharp-shinned hawk, a small member of the Accipitrinae subfamily Hawks are birds of prey of the family Accipitridae. They are very widely distributed and are found on all continents, except Ant
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 0x1e026b3a64226f23b99e022a0bc033cb4a2f1a5165f62ce144a92f685a785c4a. 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/1eb82c10-1fba-4cbe-b5ef-a3d047802a18.json and https://artists.proofprofile.net/proofs/artist/1eb82c10-1fba-4cbe-b5ef-a3d047802a18.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 0xea61e35d9a9b338486d3accffe72d0e26f66ed643822f0c435cc2a8a8a89dc05. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TCJPL2008649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2d4fb6ab418123b8c98b0a428049490c257532d35668c08205aa8648ef521d8. 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/TCJPL2008650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76d832657a917538af0771783396b8f096b599a085105edf89f027d70a397d8d. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/TCJPL2008654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x781fb381e164b906f8a581fa1c26b78891bd3bc0f6e7c91a656642307e773834. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/TCJPO2168030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8759f82e463135fbdb345fdfcb8c79d1285b38215eaf4f5b7f47392d6a278949. 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/TCJPP2182479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dfdc2fade28643dc0c69ad56e664a556bb191dc7deb1e3a76df8d6f9f271b5d. 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/TCJPS2279908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad3389fc8fe0ad7d17a2e8cad6bfc443e8627d82dfc89f83dd5878f4f0088df2. 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/TCJPV2315132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x149c856f6ccc3089f36726d9f6629e2cff23fb782530c0804ebef5cd2fda775a. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/TCJPV2315137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5efd1adc06d5b38b13d58943cbb9e17e0ac5b10263a15b3d3939c1377f0a89fa. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/TCJPV2315163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11dbea87b7e2003ec14b19ee9ebd6d2ad7a77557e5c9489f5afd72cc25a8d94f. 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/TCJPW2385857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d7aafcc345f92248e024c9f8c355ca1d254636abffccdaa70020fcdd5a604c0. 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/TCJPX2329602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25a027523e2ddfdeab9813bc97e9d2132b3b0d9f74ba6f8aa7628817ac9b5664. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/TCJPY2321656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x715700c8124a8301d77b65f9dd40f753f233f97de815a209f3a105f34721efc6. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/TCJPZ2487252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x330f2a98cfca92569223b7b2cdbc500c7dc6b3d8428a7d7b5eecbb62db89cff4. 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/TCJPA2494942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bf04771f0e2f1917a55379b70b9f53cfb6ae73b7cc057478b8a3a0144e8b0fb. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/TCJPA2494945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8556f6edb42fdbb63809e7bd5adba80d81d8dbef63261740fec86f878801c3da. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T13:52:01Z), 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/TCJPA2494952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcda9365036a52285930ecda371024e9fea6db85353417c965ce37be6a5dc0527. 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/TCJPA2494959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c0b5466d7896bf1e288d6ca322d7faa8ed672c72adfabb78e0b10a7c3f82ecc. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/TCJPD2543927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8128925fd9413c51340343b3ee370d610858ae38e8073542b4fc16bffccc9e5b. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/TCJPD2569072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb07f1b26b7502ce2b08ec9e53391f1cd1be38c01903fad9b4c25279fa204d99e. 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/TCJPD2569075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1235cbcc511cd46e8d0e29b81383a13b68849a578f226bbd42a78e6823ac253. Chain 2 (Bitcoin): anchored in block 957779 (2026-07-13T00:19:08Z), 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/TCJPF2532336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1d5a13b2cb645aa77bf2658a83636f68bbcaa25c38b98580c82710e4a99f443. 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/TCJPF2532338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82d94cd8c081cf003736f58875bf33cd60ed0e8b26b4f1b67b2aa94dfd54665f. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/TCJPF2532340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56be4f9502bada59a20c403d706bd5e41c6b3fbb1964e3a27b23a6f80a856781. 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/TCJPI2502892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb754e42fc91cd38c84ff8d77f0003e8e260bb6ac43f80bd765c5d20b782e6730. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/US4A80500590.