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 0x451f12062104982d50a63bb7ba40959f1d442babcc68c73044990f415661380f. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/55d02a9b-ea63-49f9-a49c-1a9c56ef381d.json and https://artists.proofprofile.net/proofs/artist/55d02a9b-ea63-49f9-a49c-1a9c56ef381d.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 0x0ea25c51f2148149c02aa9661eec7884beed1327d1057b0963f60d5857a855e6. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/US92U1513001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb134f8332141a8f6472fc3682a35a758c7d19f927e92ba38c5b2fab273aa6bcc. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/US92U1513002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80fabf8f1a839396f64b6fb243e77751f627bfdc709afe881d51ee501d61fd68. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/US92U1513003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdb572d2c4e145aa1f43b65f9bf6fdefe634ffe54d85c74079d2cce987424b2a. 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/US92U1513004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53b9259d3873aebc3cb625b1956dc50a04f3c73028d59ae4414843a81c38bf89. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/US92U1513005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb4ebed754871ecc2c3f31c2397a8ac00c0ef939de5469044ff0ef3601faa636. 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/US92U1513007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ccc435c730c52aca45ea4dc223570f7f73c7161bd41516cc47417f67d28af12. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/US92U1513012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eb0b99da2a914e528feaa3f4d2a1880d5742a1060036fb3dd7489af01be21a8. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/US92U1513014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e5a63d8deeaefee2203492f23873c179f7c2382aff61572c293c3b16eea1069. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/US92U1409201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe889a19ffb0b84c931b73b151a08177d11210dae0b4697682cd2d22022f3e603. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/US92U1409202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78b54d2b711e09240c6417c12720adaecb279178c3f1ae51929aba70c5244ee1. 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/US92U1409203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe99e8f60b011d48ea94e34d6b29da067b458c524818b412b0dfc1db09c43d3eb. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/US92U1409205.