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 0x5e40cc60c23331dcb53569fc27a51e019141f496ec5866cdd132054a606a8968. 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/1ba35ba8-ea69-4b3e-a293-f492b4a9d901.json and https://artists.proofprofile.net/proofs/artist/1ba35ba8-ea69-4b3e-a293-f492b4a9d901.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
De streken van Tante Toets - Radio versie
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 0x31b575dc8fb74e405618e48ee246d96e51d297fab847186b210c28f6fe06ed41. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/NLR790500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb814ec1a3988c0749458c1958c49f0f9b8e39d0cfefe6480bd440835448be0a3. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/NLS241201802.
Een Echte Piet (De Club Van Sinterklaas)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aea681a7554a7c9fa05205f888d21a70f39841c4da965190c9cf97082b448fc. 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/NLS241204059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa896cd4c4079a6d274b2f046c7793fe539fa2164ad463febaf940d04d5d6e03b. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/NLHR51845719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52fd21ebf138aa3f2af3423dda4aa5cd3b6f7192f7e324db9e095ea29c3f50ea. 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/NLHR51958028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03c0ff0f28ff90f7cfb60c6a1dddcc8f7d29c604ae60d5af018526628b88102e. 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/NL2QQ2100095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a86565fc9c04dde7e2eb502bbb24d826a9b24845c102daeeef0743a8e19aff9. 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/NL2QQ2100094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x388ce623388ebc37530cb6ae385878f8fd4c5dbc3980da96e23a883466f74a17. 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/NL2QQ2100097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73568c886dedcdfee5455b643af080f3c216e9c43028296a860d270b645c6a9b. 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/NL2QQ2100104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4f2e784a0be58545c750f41873275254705e474c2edb650e7b13c18d6fa8267. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/NL2QQ2100105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80a3a09219524a65870fa7519310695e4c54b81395dc62f7e0b18131f9ffa1f0. 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/NL2QQ2100107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b94027969076f8f9ba51c060af88fe11c412bb7c66e206a182547c4b81e0f98. 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/NLU7E2300066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeea5cb0ae6c11f44bb0cbd38bcd12ef54e1f61501a6192c3cc4ab4b53f0331b9. 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/NLU7E2300065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd527bff46d3305ace1841a32e948dec0ac85a81095b1dd26a8b57127833585c9. 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/NLU7E2300072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64f6f19d6a3f5e220da59c9aef926b2b54733c26344af61c91903534501a5d59. 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/NLU7E2300068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74787c2b71c418f531ca78449f73af57673d1ad305a6945a62da26e58687d33d. 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/NLU7E2300074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50d8ee11c434ef4d8442d3c053366a315bb75ecf2e021b5815f4b4aef7d87193. 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/NL2QQ2000073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e7033736b161eb7dd09dac6ec78f5d23b9155bff6b7255d6c617f4aeb7609d2. 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/NL2QQ2000081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x275613c8ed2cf28c3cb0796b9a6002574ac4be3a236b0e2cb98ca6d9f4c22d19. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NL2QQ2000085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d909e5d549e7586623402c065bd60c5bf16ddc6f2071a968a1de6f1974a0cb5. 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/NL2QQ2000086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3286529db49e2795e6840bd3cdbaa6b0582fc4d3942b946994e30e1d095b2f0b. 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/NL2QQ2000087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94d06415b6b5f688e5ae5885c13cf3cdf8a4113ef79e5226606b29ac1e53f9b9. 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/NL2QQ2000088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x082d413ed9a797b3ffb6b9d358afca0babc236c6b310ac522ed188ddb16c583f. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/NL2QQ2000090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58a9edab1cb9493f127a4ff64832d520ec02e659df7ae59929f2401d046734d0. 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/NLU7E2200018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x918d0d6988f322396ce51f926bd086584b9cb6dbf11803bdda16b48c11facc0d. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLU7E2200007.