thumbnail|Oliver Green is a research fellow at the London Transport Museum. Oliver Green (born December 1951) is an author and transport historian who has written widely on the history of public trans
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x778879239cfeae86f05d0a17ebe3ccff9876358b5355f5acc98a00d119c663e6. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2c9bff41-1a0b-438c-ab2d-caeb0cc11977.json and https://artists.proofprofile.net/proofs/artist/2c9bff41-1a0b-438c-ab2d-caeb0cc11977.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33cd4dea7d84c84e901f68a31ce35846faa1036153b0c007b9bd33f17c79248e. 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/ITB551815069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4630f6fec4c66bd612b7f264b15d9b624e61e75a11069e286702200f5bea54ac. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T14:08:35Z), 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/ITB551815359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7934062c3e65414c9adac1d77538bdac5f733cf1bfb36fd7e471d867bb8735df. 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/ITB551915500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31e6e555497dade0f07809d3ac51a8bbfae683ead1df4de7d92a042162d29af6. 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/ITUD51900026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b83319eacb81acd2cc5ea39223594a58964508d9a8c0cdf5851bbf10aafb3dc. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ITUD52100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe25c51e6afb2bb68afb958efb82393f43b5a7c561eb30ded0956398ea269dd3d. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/ITUD52100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9dbbeb6664a20c689093c45119cd6fdc8d1eb4a07861c0ffd58e66641d88aec. 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/ITB552116504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65a3b29e0e950674df6a1a3353f703390ae29b2f5b9e00fa5b2a3d3e8fc58b77. 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/ITB552216703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4433e2c00152f9f4d33ac26e038a3e4e7eaedcabe78f63856c5db6f27e9a2d0f. 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/ITB552216780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe773a7ee83b088b4ef71ea34012387afeeecc5c0df87277bc62a55646bbd61ca. 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/ITB552316886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8dca501eec826ab6d38900b8af251aed066ac51b6f61353900d26b6e34b003e. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T04:24:43Z), 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/ITB552316915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbec8d7f6aa790d6b3e51a376c2d6e2078311b9b9725edd3623b683372bd06b58. Chain 2 (Bitcoin): anchored in block 957874 (2026-07-13T15:43:57Z), 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/ITB552316968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d76d34cf7be62105f865cd8643aa14b2a8398f4bbff2b3c3fe623c3998f3722. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/ITB552317098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4d943c0cc2285b4a7622377378b806fa0f7051abbcaf502add97120e9ee584f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/US38Y2314454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x267fcdb7b48fa75dd6dd426711b45c1cd69f95bdd1fb932fe0df5cf89df02326. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/US38Y2409505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x916de907fb9b4aa696295ce562bd26da3871563070043a24ebb77fdcb9d3813c. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/ITB552417341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa48b9e88f680984b6f370f7ed49a43bd95c7ca059f03d46aa09c6d17e993730c. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ITB552417388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed6f84e170a6a9e751ee01af07304b065ac4e339973f5d8497517c0dd9bcba38. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/ITB551915521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabeded9de5af41a7c726a438cb8d2eea8660d5d5ddf8d526fd83c40ea7e72acb. 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/IT4OS1800024.