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 0x5977afb9ff310ea61d689a8f53bfa42b0b0db2c46b4e07364660cbc9d673beb9. 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/ef615631-6eeb-4533-a7ce-48ee0f60cde4.json and https://artists.proofprofile.net/proofs/artist/ef615631-6eeb-4533-a7ce-48ee0f60cde4.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 0x312ce8921f913b770c0e6852ed0dbf0f8ab995cb49366d74031931b4f8351bb9. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/ESA011713712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x312ce8921f913b770c0e6852ed0dbf0f8ab995cb49366d74031931b4f8351bb9. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/ESA011713712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1ea9adeb1aeeeb2c4b57036be873f538c55e7a8258b9af897159ba4a122889d. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/ESA011804202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06243616f85a8eda44125d504864ff715625550e9667d22393912d97886fe1ff. 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/ESA011807836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05ce4659331f3cec2928ec049741a87f6f88349470e398d53fbc8637f99f8c89. 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/ESA011908274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aef04efe41b40f6dd95460f68b119b81892bae2e94217cc74c38b2ac067d59d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ESA011916150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19b36802f5029e80cd12a6b63c79f3759b8ca6c53d2669f1dd8d7bf12f6a9de6. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/ESA012029160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8150953f43385669f32c1d75162e028b28b329e20ae54a711332cc20325143b. 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/ES71G2022872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bd5370e22983bbdec50a399d46a1d9e466502ed75fab0e16d5f2dabc20fde81. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/ESA011741881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a9a91e9176cdf8cd0f27470339015aeba1b2d4a686b0a52ce3f5742012c1aa4. 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/ESA011783647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a343ee2235a0e90143552e7c9ca0d1bde1faa0863069d909f77332e8cd6c506. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/ESA012134267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57a0bf7945a38efc9bf189de8b3ca3436bc63043c7303361c3fc4675639acfc0. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/ESA012159296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc75b8c28e1160e439bb28ea363f9455ded50493829871bbe050b64aaf513a04e. 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/ESA092212889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc75b8c28e1160e439bb28ea363f9455ded50493829871bbe050b64aaf513a04e. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/ESA092212889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe34499679b2813e965fc9bd99eaaf5e93a07525553181e2a00aeb0f484301d20. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZTBA2574556.