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 0x82e36423c10f918d4859d1b4754b0f0b92ccd682a1921bacceda91f2d9c5cc41. 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/c3f67f74-d897-44c0-9a8d-b78312b3c461.json and https://artists.proofprofile.net/proofs/artist/c3f67f74-d897-44c0-9a8d-b78312b3c461.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 0xb2ffee891fe5fa91c834f206efb51dda94ae8f934d97ed59f0426f9f6dcde4fd. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZHZ42230323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcac9cb7bfdb8bd6f86ecfade893d6ce703e0745c4c3b572ba951c510fc368b4. 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/BXF852100069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcee1d266ea509a92ec6a453484f4b3d9e373db94abe7d16ca20e7a04b8a01627. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/BXF852100063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50eb718fb3520425275545124f7c0d262fcf3d559587e72e37a96b2d7e93a734. 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/BXF852100067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e00506876911dcc54f5a632df564e48ed505170f5517af6b5d01c53e4a833d6. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/BXF852100061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x270d9afd90776130fe90db62d62820581546bb03115a618bb8b64fa0af0cb963. 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/BXF852100064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65a910e3aba0cdf8cf91e6e92cef90f23a7a0df063a155bd79399bac35cda9f8. 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/BXF852100070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66b8d7757432ff20dfaa164a322d221b8bea9a12396022c1ef84bae63f352cea. 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/BXF852100073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b5296cb966c3955efaf7c9b95023d0d10006ad9fe8cbb51504615713aa186e3. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/BXF852100065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x170b87c66218de267a293ed64edb0604009c8a35ff368c1c4ca38a666036c9bc. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/BXF852100068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79ba33a829baad5d485ddb8b2553741d96d6fb1836b120210a8cca9d400bea58. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/BXF852100074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcda5bfd038f656a2747de8fb2ecd5c24f1d63b9b91684c2cdc991066049b0257. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZTVM2153824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb9be42075d862aa6d0b8bf2ff7a1ba6737f187fafb25ec268a75d9e5a716369. 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/BXF852100056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ec450c8e1652f5f210089714c1fe9933df039e4c2c2419cd5c8227d6bbde93e. 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/BXF852100057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8864a92e9c192082e3e210db955ec82a1a11c0faea2dc0580a6958dafb5b36e8. 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/QZWDW2405409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf96b13c2e0c953f12e15a13a83def0de55d9bce8dfba2d6965ba691e72458454. 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/BCMVV2200126.