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 0x366fafa272802c1e7006087ec27f019ccbb20745190349e221b5fad4fdca19e0. 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/a78afdd4-4363-405d-8dd5-4a835c893389.json and https://artists.proofprofile.net/proofs/artist/a78afdd4-4363-405d-8dd5-4a835c893389.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 0x91ac4b87e5d937d2fadd12c3b3f6206bddd785043cbbbedcb5869efb6ec195ee. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/NLL150500121.
Best of Kees Kraayenoord: Speak The Words
Best of Kees Kraayenoord: Speak the Words
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf8a9ed0366740c0beab13509f06f85a173ff200713ec707356157e8f33fe077. 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/US25L1400056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec3c8479042ca0011999e1aa8bcc31d7116c6115643dc48427755c1e66c28ad7. 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/US25L1400064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42000fc1a3e15a6a538d6d7644144bbdddd230d042ea7f304827ef430d0375ac. 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/US25L1600470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ff5d296b830be51c7eec803d2360ae86e889402f63a5f3b2b6479eceb27a70a. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/US25L1600476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4465c9102b5498e1b082984033e8c499f1e3ad892e5dd6302911ff780135ffc5. 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/US25L1600469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4be26b0651d512ffa07c47c0823bd002703bb7842d79f32ec55b9d87d87da70. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/US25L1600471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd81a3de5333014fe50d750050b6f7a9fef0e5274fcfdc390f53ecd46c191c00d. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/US25L1600472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabbf405f3857b744eaaaaa0912b189ef84bc21a1e40985bad3c8801b83301c43. 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/US25L1600473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef36f06a3609deffa494ece9b300781815a1b96ea57c69769be4ba45be001c4c. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/US25L1600477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x573dee9d9fcb4cc46d076f1bad824b8d22977b29604d6d6ceee42563e60959cc. 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/US25L1600480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1065bf43080ded34d6dd7b0b0e9eee36ab87c443a95ebef64033a9e202d43657. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/US25L1900116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91ac4b87e5d937d2fadd12c3b3f6206bddd785043cbbbedcb5869efb6ec195ee. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/NLL150500121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1862a20ae490b2c26bdee82837f6747ac9052ff16ecb5f331dc73fc1b8d2343e. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/US25L1500205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7580327acf293b90b3b8ef3be7f7768229773ce623eb4e0f3af2ff7cf6c73d98. 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/US25L1500210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba8a257872f089f1c1920e39fb07b91a13df2c1569ef1b515f6a108260559cdc. 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/GBDPR2006319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d3ab35287e14dcb1dad1226e5ef28b79d87827e191d793d662d8dd261ac7c4c. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/GBDPR2006325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x318d51e025c7e2c12ab64ed13e5ab6ca829cee13d8fa112d954deff39293839f. 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/NLL150600353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88d5252e04d37fe2d422abd824337f6fadf761327ffb5237a5c1ea55bab57fb2. 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/NL1YX2100032.