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 0x417b05ba75c7911a32d816163f033e4dfed050b1afac97a00896e39c7823c532. Chain 2 (Bitcoin): anchored in block 953719 (2026-06-15T01:07:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/891d96d4-5038-47d0-8c1f-33e9682adfb0.json and https://artists.proofprofile.net/proofs/artist/891d96d4-5038-47d0-8c1f-33e9682adfb0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The Ethnic Sampler, Vol. 4 (Holland / Hungary / Mexico / Norway / Russia / South East Asia: Vietnam - Cambodia - Laos - Malaysia / Sweden / Turkey / USA / West Indies)
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 0xcc81821d0ca451c5b8072323e9934b771b56aa334a31d0084dbd6ab210c98132. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/DEB639420701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf93775502d46ac6ff895e17f2a5c7e6ff4784ad96bbe2fa0f71a63e59efd5110. 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/DEB639420710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25f11dede587bd2fd3812696772d06f6e52a8e3070ee524d150a7560010d3edf. 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/DEB639420718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb64ba9d3c51dc956a395bc37a48c28b4e4c253e5373ce69d743989e1622b3f7d. 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/DEB639420725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4efb3085832f43d34af7526d06f6ce7cdce92d53ffa478fe37fe65f3b1d347e. 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/DEB639420742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb61dcf2cdafe9511b1fd8a09eb258fbe3a7b90c017dd4523802ff85a37853db2. 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/NLR1K2308011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2679ab34cb66b4756c70f943448b5033cc9f3052b3b3bf7b850397c17a1cfca. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/NLR1K2275011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69018079fc1ef89e2afc2fa0315228a6992bd6b4b213957e29d5d40fd542c822. 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/NLR1K2275021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbef3d7d57cc70adc5758583159876f2b24ad130ff6d5ec4b0262589f64cd890e. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/NLR1K2275061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd67aedfcc2ca1ff2a365b013b1d3612afdbc1fb49019d64ff5a22f56179fa645. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/NLR1K2275131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1bfbb12ed8450d7ea078ef54a5d6e2228d8be2b02fbf2623c1a159dbc800444. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/NLR1K2275221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x502fc5cfa9ee1f5a1df538287a95384d040bf6b57c78856545bd7ae47594ed05. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/NLR1K2275231.
De Fabeltjeskrant - Originele Geluidsband van de TV Serie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x262c78425165510bbd5aebed1e799447702215bbe31c6771d45bc16a5d1d1135. 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/NLR1K2166011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb84e8fcd3c2236de6a96b31d8530f4fddbc211f872ad1878b6c58cc4f5ea14a9. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/NLR1K2166021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84ee0a77f6b4d69bd3341c03e627613ed50d800e68fcbb8b3d6966b4e4fc26b5. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/NLR1K2166031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56d03e37aa41f7274e06342b5e096097d9134af0ecdd128fdfca01acdb6c415c. 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/NLR1K2166041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc127f38f6e86ae40c71d8a4a91553aaf6e74b5f92c260d397e72d27fa98bc509. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/NLR1K2166051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6c54059cc0a9c0b6c02eac51203c14a5d0037c2f0ff6b150f5b9510c3163bdd. 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/NLR1K2166061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf4258c8db032d7e02bb2fb7e2287dc1e4dbd7fa61d4affd5eafa431a09ff02d. 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/NLR1K2166071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9e9f170c2c0941d1634882299d21117ffab9a1f035ffbf24b1ba7cf6a8f8491. 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/NLR1K2166081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x265b66feb4688f04829b88d32977f99719a7a282b6bb5cee065d7ded5299d47a. 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/NLR1K2166091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9b72101232c6f95af424316e4d4b34a7318725c1770f3f22fadd5b55c6da5d6. 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/NLR1K2166101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b6269c9689ef4513b4ce9ebee6b0a0951daaa8c271dca278faa3cde7d539e83. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/NLR1K2166111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3def04aa4a47e372b71081c8bcdb3828df6bd7087d5d65207c054d4b02705fa. 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/NLR1K2166121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bda35b1b72137271af511169eb510cec8661a5160a723595ecd7075c4691d9c. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/NLR1K2166131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63d95a55164934dab568829ccb0ba70691b4ea320093cc6f876f9869583336e1. 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/NLR1K2147051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf73f810b8c16e07a5ea2f58eccec380db0268e99dec678344fa694aa77c653b4. 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/NLR1K2147091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e7cb6b4c9df1de7b5a4e596b0b3e0a4e3dd332107da06bd641fc7b314ee07e7. 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/NLR1K2147101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x449d0c330edf1f381aee9ba5a1b9ed740b1ac043be5f32d11a592afd72f446cc. 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/NLR1K1752311.
Authentic Dutch Melodeon Folk Dance Tunes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacb785b88890f9f468ec249473fadc79c0a35cbd65a1ea8c496798a9331a3035. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/NLR1K2257121.