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 0xed41545fc2f9d04b9b7b9b8ff4157405523546d2cfdc60eb64b4ed27e19caa56. 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/d69e5949-ea75-4ba5-9b95-89b9512b3e5a.json and https://artists.proofprofile.net/proofs/artist/d69e5949-ea75-4ba5-9b95-89b9512b3e5a.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 0x477c5df79bd3f940940d55d7cd43872b02905f04deb278234e47926a684b4b89. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZTB72396577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf29349940e8e32a550b32a8c8dea2f2751e1ae55ccfe7263d967d0d3b27660c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNWR2391160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb016caefca09d95278753e99859d78dcb31feac56c732a30514e6c1100a980e2. 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/QZK6M2364871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x938e23af94fa540d464d4b8c8b0cb15db0d0b2e53260762651135512382c1ac0. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNWR2391161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2efd39e5cace8d5e2facad929ac0202d4a1ed1c1ffa3fef8ccfa516a58e4c0e2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNWR2391162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8e1809b9919156ee4cdc711bf0aeddf64f4b48eacbf93c5d112d7df9fc38604. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZNWR2391163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb016caefca09d95278753e99859d78dcb31feac56c732a30514e6c1100a980e2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZK6M2364871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a350ef9b5c113f047ba7026d5128c1b63f9f45073c843be6cf1816d70b3e922. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZHNB2313047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ec4ab7d5de8f85ac6948d28f78b764a73522ccc5ed60476c445f0fcbd5f1c86. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZTB32225047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92280db71b63782be122798d46121e5b104a7042a9f04fdd0b1e332607c4807. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZK6K2261314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4538722f68b54129e05eb8eb4d10413e40a3b87f35a1a3461b1da8e5549f9926. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NL5HJ2400257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ea167e2258477102678e770265b44f70477dddf314bae4a23790bb319c09970. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US38Y2426901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x055f57d1ffde01c5d4682c1e1ba456d1d394aa1df8676b2bc09a99c28975ec8e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZTAU2469626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10ebb0ff73c7c2a673aaa80b60db6fcc7302cdc83d5627f2fd644eb1036e15fc. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZRP52459292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ab524a42e5f262d14e57242edec5e4597173d7b017adc1e6b4ca2718cf738e7. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZMER2436438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x989d84adc0006575705d589f9ffec91cd7818f639195a2392ba8691cb215c553. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZFZ32408817.