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 0x554d694a6567a91efa5b9e70c254c532c8000166b2b5a0fccbf61e97b3e07188. Chain 2 (Bitcoin): anchored in block 953633 (2026-06-14T12:47:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/35355f3a-baff-426d-9fbd-2c9bfec8178b.json and https://artists.proofprofile.net/proofs/artist/35355f3a-baff-426d-9fbd-2c9bfec8178b.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 0x8b1fab35db0d1c796dd3a7b9ca570e9f4794bfd599c65f593c69a4b99d0b6a24. 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/QM6XS1601965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78e9161b0b750fcf60dad71c53c259f86f1bdcf04795dc4230d1cf460fb9a1c5. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QM6XS1601966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebd7499dd654878ecb3b58f99dfeb29561e24ce1920dd1e782918c71f83d55f4. 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/QM6XS1601967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf980f6a253149ff18c4152d8cb58f40951a5b6dc39c73bd710b3b8a9a052b2e6. 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/QM6XS1601972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7ab47ecc65f54424d6675d452a9e4f6ec9ce3a3752bce69a721c4babdd56815. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T19:55:06Z), 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/QM6XS1601978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x816e0c8620e04277d38b1fbbff24e0b6dc4fd57df9361cd091eaa0fbcf729296. 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/QM6XS1601983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8392f60d25c311fc30b0f5a1dd84e5d1872babc0cfe64a5af4323bf6aeeff3d8. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T08:49:53Z), 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/QM6XS1576318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c1f16ea09eeb069f7e3a71624c372be0f1a4d183c7e82290322ab9395ad2433. 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/DESC61600088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38e44ae332d65acc0557e0007f6d5f70cd78cf6eaef3264b59ec61b70f1747da. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/DESC61600090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x676638e2dbdcc0202f022bbf7549cff4ea307215bec3d0bad0eb770c3ca9c99f. 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/DESC61300021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c6acef903a77e159f403e0a260befad6a664f3e5606c0f230c98bb0ef7b0cd9. 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/DESC61300022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8d8dbb13ff4255911a083e923506712b5b51e567f777eb80d8bf5b67d9c1a17. 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/DESC61300023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc556b4a140818d340e44197cd1c30d785eb23f7a35d78c81693881bb4a54c2c. 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/DESC61300024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f234d97214da529dcb2ddad82f3374d082e4ff80921ed79768e3f8743ae2dae. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T21:05:08Z), 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/DESC61300025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x487a678128cb2d4ae7f43e79f96dc025ded3ed4463993310f49a1a29b21d215a. 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/DESC61300026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28ec92b5c539a483b7c106f816c47103beb1c4e9dc3e860e853c2b92d9462a1e. 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/DESC61300027.