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 0xa6708d6b02117c50ab3db204c26bf6e83f41cde6d62f687089f2c9df69fd5b51. 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/a5c54a6f-e853-4eca-a3ad-9eb50b45ac34.json and https://artists.proofprofile.net/proofs/artist/a5c54a6f-e853-4eca-a3ad-9eb50b45ac34.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 0x46fee7491ec7dc70a784c990f48bd5af628d8312d9d012910522fcd8be8a9ecf. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/QZDA41900976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79a66fa464db83da38a4a8bd2b4244bb77069b66b68fa50ea32b71c4f0e3858d. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/QZHN71932526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4b5a3956dc5201f4996e96494abd6cf24586459b28353137e3eb6cd7bcebdea. 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/QZFYX1902907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46fee7491ec7dc70a784c990f48bd5af628d8312d9d012910522fcd8be8a9ecf. 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/QZDA41900976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f9462e475647617d4099d2398922b0e5db7f05dd782a2fc1d5ce31336448c27. 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/QZHN71932527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac373af0a0aec539f22bc85d6d7453a579484f31e6529e42d8e3c2b8813ab9ac. 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/QZHN71932528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f8b4cb4fa875344a4d4017bf09ad0f2770eed677f5ce2c0b87c7c0acc0a90f4. 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/QZHN71932529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd853022a951001f7260794d4f79bc0c6c4e0b0d60c1c0137a125a8c66664e67. 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/QZHN71932531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbefc5fdfef04a27646047cf1097ec12be1feef4d54e3e37b0b6f2c13c91563e9. 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/QZHN71932532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa29c4747c78e1809d0dc5d3f8b09b1288c90c996a497488bf61f8ec242e2bc29. Chain 2 (Bitcoin): anchored in block 958635 (2026-07-19T00:58:42Z), 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/QZHNB1918501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbab30380764be181c2b1fad862b4411c732a97046fd3f4cbd556dd79e980e56. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZQAY2395836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e10d30f662cfd0077f0e18f1e6696f8f5f567bae94004a6e1a0cb896d0c45b4. 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/UKW3Z2400444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b617b3258e7f04d5917468ff18138d41beea1dfee86488bce51ee1328f12e12. 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/UKW3Z2404007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bca676a6c6ad3a918b6bae5a21fbe5f99776308fcfb895020f3c64e989c1c90. 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/QZTB82371084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b9d89ffceeabb7fbc37f21763af11582f78679c7e6697cf8e576a9c55694daf. 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/QZHN41943157.