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 0xb3fb85360f22e79be2ef22d01b77a7a0c7da0021baa623763db3a514a2f59cce. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4a34f022-fa97-4313-a914-66b6e89dc944.json and https://artists.proofprofile.net/proofs/artist/4a34f022-fa97-4313-a914-66b6e89dc944.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 0xe8516eac8ededd7f607666beeae84b3653923a165a0ac42c4e59c56295853ece. 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/NLC350133801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79c9658a683d8bff4bec82ed21a0ffa4fddd80708b4ef17f2d9dbb299608ff0e. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/NLC350133802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x581f0616d21f53c42ec6f6bac040a75241b638c3622649ba65a5dec446ba977b. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/NLC350133803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x232b19041d24ba4fc15fe5b060ba701c8a80b1412c45a44f339fe100bc917162. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/NLC350133805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05be368e454e91d29832c9bca38bdf08ad33270b8f3beae677747f1f41787120. 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/NLC350133806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5f3adaf715417fae04cc7b7dfe7c7d69a478ec4551b8b7f819f2bc023038135. 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/NLC350133807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84c0c588e607500bfa282f901dd3f1aae32ede42b97848ee06f40b5f1c9d9a6c. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/NLC350133808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cab57af5f84adee89e7b0ffe55d2e784373afe9d524575b69a86fe173f2a26f. 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/NLC350133809.
Matrozenkoor uit "Der Fliegende Holländer"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcc2bad9751acef25975856bfcadfbd6cef6c7038c02cc3cc62c8d0dfd856071. 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/NLC350133810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06b1ffb2bd5d56d1cd9f82b64d88b61756e52ac8a75fb7685e1432e190725cef. 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/NLC350133811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae0092c2765e7f446e6b41c37898fe1f88924924375741a00727ea6bb0dc441f. 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/NLC350133812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62bc41357b1054b019ed554732792cb423f55a4246507bbde24378ff61a86374. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/NLC350133813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39a6d6dfbe4ecf7cf0644ccb853c16ec73c37208af44baf4d47600ea5fe03c35. 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/NLC350133814.