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 0xc85dfaeb5fa99fed737b0fc46a96d5055458f86d7a800b5f1f8fb9a6200e46f6. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2981119f-67a7-4579-9658-d70580933910.json and https://artists.proofprofile.net/proofs/artist/2981119f-67a7-4579-9658-d70580933910.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 0x07d6bd4b4a870086bcf56c2b70c186dc3d22fa12807ab2a426d219d467d3856c. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/TR6930800057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa1bf008bea02017d17d1ff62171a16191d37c6f7e0d0fd177dd3d97a65d1415. 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/TR6930800062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18af17c949632ae6ef1cd6e27ada97c56c801c2c0fc6875a9f9dede769139b63. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TR2500600090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31c18ff8e05d16ab11461695ba58b15b779b074d2ebb91e91304ea74f9763284. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/TR2500600083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9fb9979369583af5039020c9317e3bb5f64036ee8579c5842b7a337060ac27f. 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/TR1580700039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c4092b3ece79184f1601c05433ba88fa9d057dabeea15da056e7b5f4c0b45e8. 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/TR1580700040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9864787fa6e8c129a2bbdb3691d1e85ed21fbdd8200580c913a9d4592f1f305. 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/TR1580700045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1e51b77546091fed46b9d985056f8e69badd844e5d0153f01dd6068d029544a. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/TR1580700041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4b47413ac072c274b0d80bd1b21f63a96fcf1bb9b785cfbe3de889dfcee2a23. 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/TR1580700043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78f13c6e13ff72071978725bd0251563c8d3b0332d0b856399bc76ea9119fde4. 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/TR1580700044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4581638d9314a7d7559b85d4160694a60f7db47088d7b724d0b6f6b853054b6. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/TR1580700046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d1f907f99663edb5e86d662f56af16caacb37c502a30fc50337c5c6522ea74b. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/TR1580700047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc196caceaac9cfaa776211e26fb934a8ea307f20262c118c6cbe341cb9f1ce3. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TR1580700048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87835ac707c7b98e55bd2a51baa37ad73c422922ad88ebc532784673b2df742a. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/TR1580700049.