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 0x225c004b921b8a1c6f049f258098793401a610446d6883640d2259cda54576bf. Chain 2 (Bitcoin): anchored in block 953605 (2026-06-14T07:39:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1111e631-cb4e-4389-9e04-41fdcd798d73.json and https://artists.proofprofile.net/proofs/artist/1111e631-cb4e-4389-9e04-41fdcd798d73.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 0x931777d8d94991bef1f22b76295b987ec2ba756adf0843093bd545f71edc6054. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/CA5KR2421502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13c4101abe15b06249f5440604463431ebbae8e541ae1864d4b07371719c3b7c. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/GBKQU2462773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x541f50d326757e7b71407390496fc1fe9385d530204f1308d4bca105f8ce1f60. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/GBKQU2462775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaaa8e7f9621931e18170c019bdab241cad2e38af051f66e6f88d587549d6a8f. 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/GBKQU2438756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3f34fca782f728296af866482fc7501930f94db0fab4ed4f50b2c4b5fdd5fda. 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/GBKQU2384973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x061d44c30c610906c84f6fca7e0663bfe64f5e5eef23f0d8501c7daf64be44d1. 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/GBKQU2384974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb02aa04d556bd2fdb84e6bc891c55c53611d16f50e9f3de61d002fcb4dd9dfa2. 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/GBKQU2384976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb52b8deb74b1595c4e6d2e9ae24fc5e96b68a8966b44519c55bb562d2b7b2616. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/CA5KR2434096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf881791a8b3685c4934d08f1d1c87d143b6815a1ca99d67ef3f383adbe193b1. 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/CA5KR2434097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c76766f0d36dd2161254cfcbb21269710436a02395758f00fd4f894c0f82ecd. 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/CA5KR2387718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51ddccad0aa6c4e1478c3ec688fcda244f9396dbee3630727825ecdc3fb1abfc. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/GBKQU2474263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9bbf6471640db9593f2343e9852f99413829c2dd12dabc7f8b1d300ff9632e1. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/GBKQU2411954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ddf134b290fb609de4fea47927d07cb0089f20d6260fe4ae065619adf78b759. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/MXA3V2401744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa76cc3698942f03ec6941ee413c863e9836b86f5d731af12aa73fe1e5e50ad6d. 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/MXA3V2401745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d93e512f55cb5bfb8686d458a0ec44490474db53386e9a2747ce37a75c17b90. 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/MXA3V2401746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96f47546611949e2d6361e5db74a4ee29ec34cb346177e53e1cf5a3a2cf2ba65. 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/MXA3V2401747.