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 0x24a4921e0ed8cf9fa3a3c18460f408d9040a3be50e36c357b7cafa6767a602d1. 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/1dddc6c9-eafe-4749-97af-4159f4ee4473.json and https://artists.proofprofile.net/proofs/artist/1dddc6c9-eafe-4749-97af-4159f4ee4473.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 0x550d67b6a6b9a63cb9238114bbebb696ace250f74de029e2e50bb0eafda1e053. Chain 2 (Bitcoin): anchored in block 958697 (2026-07-19T07:58:24Z), 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/NLW2R2029527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6f93df56e983e827a687aa1fb9d02be805a842a1c5a8f141807c24f56e8a657. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/NLW2R2029530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e7900189057fe2ce4ef3ce9d3df540c5e03b1baa0c0acf4bd7516ebf0816dfa. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/NLW2R2029542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5054f286ba92fb6758352ed52a0244badff0d9d40f38d9dd89f72ed649c1d308. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/NLW2R2029559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ba2d5b1cac5b3b067efa5c4ecbc41e72fa3c7c6176ee15d48d1f427ea682e00. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/NLW2R2029558.
De allergrootste hits van De Marlets...Deel 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5566bee5ef294b4fe1aaa6dfbc7189843d0223d526fbfafb34d0e792ea115305. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/NLA631400616.
De allergrootste hits van De Marlets...Deel 2
16 Telstar Favorieten uit de Tijd van Toen, Vol. 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x825d79a369dddeb9054f2de9c5839d0f279b2c48b505c1c9cefe2c9686dd4e7a. 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/NLA349500023.
De Allergrootste Ambiance Hits....Voor Feesten en Partijen. Deel 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a387ab6f2b46164027ae0b93893e942711fa7061cf4f75ccbde829957c70ce5. 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/NLW2R1824452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d7de6fb65d229a02ef3725a2533ae947de7c1d2a9e7ee2489935e47ec86435c. 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/NLW2R1824455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae8db6fdd7d4d574fb98ad46ac3e82643f83f29680efaff36fd714d1f865f2af. 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/NLW2R1824457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8771fd9bf12053c8bceefee45c650bc67e1de4a311757530c9b4fd5a0a78f83. 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/NLW2R1824460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb775f313aeb04cc9501d36a8a3e94b88a7d8b64f1ba4d286523dd0a2a565061e. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/NLW2R1824462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7658638565f3b1fe32fdcae55cb4443b03d233856f058aea002277e1e53b4a06. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/NLW2R1824465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7e59864ae31ff594232c6622d1c539ae5c612b2ff43f21dcc050df677824a97. 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/NLW2R1824471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1c8dd36169773f693b7ddf996fef0fd194c431fe51b3e68f5e5d199be53c2b9. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NLW2R1824474.