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 0xed1a721a059e9cdc6c7eacee75f9fccda4bd2e6e7fc4d5d9cf3ee2d4a3bc9226. 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/fd4d1936-42b0-4298-b917-4fc640ca38cd.json and https://artists.proofprofile.net/proofs/artist/fd4d1936-42b0-4298-b917-4fc640ca38cd.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 0xeab6b94764155de0f24dc2799d414c74125b589d72c95adec24d8988390b29f7. 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/NLA349700214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf71f2747d8b0e291f77a19a29bb3071592c857c56a0695e21c9f8fea551fd09. 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/NLA349900220.
De Regenboog Serie: Duo Onbekend, Vol. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcbc2fdc196973db38d129209d0df722720de31bfe4da1980c6aef13d98159fc. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/NLAX70922603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd445be991f5d7543635eec3f00ecab8d2ab7432d4a9bae56c3da3cfe67b2174. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/NLAX70922604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf830ff9781f564ff40cab862880e9e871796a3bcca99df613aa41fa30bee4e0. 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/NLAX70922605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eaf3e76efe47b62747d58430cd9e2ddada559a3d9c071509b5353ec0de36a08. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/NLAX70922609.
De Regenboog Serie: Duo Onbekend, Vol. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ec86ddd49e4aa2e2fe547af86599960c37eb5e7b3afbf1c5440a6b1987f7bd6. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/NLAX70922589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4b33afdaa6e5e6c5977008b9735a84e9b32c21ccfc6db11f10895830123692f. 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/NLAX70922593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78b91922e67c72f1d414d43aacff2a10939592e11ab7285fc70b92be40c95045. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/NLAX70922594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1da18c74e6fcfd06d38dd74e75c923252eab6eda166d6ec3c1661dd3072db9e. 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/NLA340900016.
De Regenboog Serie: De Grootste Hits - De Vergeten Piraten Hits, Vol. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1da18c74e6fcfd06d38dd74e75c923252eab6eda166d6ec3c1661dd3072db9e. 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/NLA340900016.
16 Telstar Favorieten uit de Tijd van Toen, Vol. 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe5585ac19bd3448cf498d8e5ce703c55b33eef50e4b3893259997e11a87e169. 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/NLA349500027.
16 Telstar Favorieten uit de Tijd van Toen, Vol. 14
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9030a3b7072b7689df1fb8ce0f671eae34b3f2223b25b7d1460ebcc4b26b3f1. 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/NLA349700160.
16 Telstar Favorieten uit de Tijd van Toen, Vol. 24
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf836592b86033feb34b359b5d65542d71ad9e2fb846e56ddb1c578dd1a2a4752. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLA340200158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb25451d5ada035bf1de76fd244cac1a5b193cfad8d8eb3f72e5cd19b236c27f8. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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/NLA349600313.
16 Telstar Favorieten uit de Tijd van Toen, Vol. 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c31101830b15b0a43a53084b10a50a6dc1f6b9049a7549e79eb6eff5b3755f9. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/NLA349500158.
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
16 Telstar Favorieten uit de Tijd van Toen, Vol. 8
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e1889cb65a8724125d3a3cecd7d7f4935c48c5260969571151344d2bfd1198f. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/NLA349600017.