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 0x30a06fc14835859bca89b2e599c9775ddc7a9ddcac026ff0b5346d36cdbe0a71. 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/0708636f-e2d1-43a9-8724-5deb81478330.json and https://artists.proofprofile.net/proofs/artist/0708636f-e2d1-43a9-8724-5deb81478330.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 0x6d2fdd246917942c2c4dbda09d6ce5864b95681531010db1b80081ce97ae2edf. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/QZMEN2218849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16c5622682364ee6ba73ac69fa03c720e25bf11721d5d9a3c5d79bec62dca92a. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZNWW2272560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3ab771be0d6bf176c20276b8a3837508e84bd9cee2bd2ca46f2345bbb871ad7. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZTB52215529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1c0f22f4539df67ab707772da0307610362f2bfff6858432c80ddc739ff23af. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZES72316368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe760af90035901310eb39b5304b34b388fee3d0894bca6bc597d0e5921672007. 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/QZTB82370962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x356a4d56843fd46b44d83b95ab59d794bd9f589f208d0ae06e9005f884073ea1. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZTB82370965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x640c549702487bfd21221e66b750583974db5f16aefc8ad5c20cb340f58e5ba4. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QZTB52394131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfae5ec938cfec053bf800cd51e68b76ab18d018751e2e7974bf2c7adf79e66ed. 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/QZTB82370963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x356a4d56843fd46b44d83b95ab59d794bd9f589f208d0ae06e9005f884073ea1. 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/QZTB82370965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa3c384d484d9ee055900e6e72fdc7c571b1d72f25dc140fe2a3f3d0cf7e14c9. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZTB82370966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6565fe9710261b9765da8917040d56cc1758a76b30d6fee070163351054c3421. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZTB82370967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51021100a915d8e396837cc58f928ebd716738c2f0aaf497b8b7de7f738726fd. 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/QZTB92403899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x529e894cd26baf82df98db7d3d5ac5aa6269400ea7ab3e48e51fedd24d61fcc9. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/QZWFQ2486268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3407a8ae8dd1926d34a044fb5238e89e950dffee63cfa4a3739c305abf6940a4. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZWFQ2486270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49cd6990a2f5dcaad4f542c78a86f2cad002a61098f2a290c2c084d8976f9c9c. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZWFQ2486271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe42ab537c8774a1f321d55b7af537320c46b9408b27a02878d6eeca862a7b712. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/QZWFQ2486272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51021100a915d8e396837cc58f928ebd716738c2f0aaf497b8b7de7f738726fd. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZTB92403899.