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 0xd1b41e2b854eccad2d92eaf9b1a6ca2e8d483ef94aca750ef84cb068dcfd91ea. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c0e6b814-bb07-4012-a3c0-b85f9f2b73b0.json and https://artists.proofprofile.net/proofs/artist/c0e6b814-bb07-4012-a3c0-b85f9f2b73b0.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 0xfca38088637268ae0d6c9350f581a375d39630d007358edea1677a2dea2126c2. 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/NLVP31200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5426dc5a740f902a74e069ec534d7f229f1ad8a8287404b8ab567db1c5cefd88. 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/NLVP31200005.
Conversations (live at the North Sea Jazz Festival 2006)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc3ded7d9ef724bffeaba0928ca34c2646031a2ce25f476df9c2a7918bfe3c7a. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/NL5TJ2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9579f37e46d6067f715a8b2b1b913614d9735afcd21719e45b3b8ea218cfbb7. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/NL5TJ2100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ac22b2b4e23060bf2059e4ed79b4360505bd19cf28e29b5903e41741c15cfe6. 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/ESA012445987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x039f54c2e92e5e41bddb314f6b4001cac448edfa9acafd00712807b27647663c. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/NLB151100641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46dfb6523f2ff33ab3d5508d4e5b50269ad75a8159b1dc9d76c065526d1e04b6. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/NLB151100642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb56aa004017a2b58a045035db12d52e1b4ac53185bb7573440cd92dce5b0acdb. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/NLB151100643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4bb5d82d6a3849fb4c765735687af2e3caed6d9e4e1d42e9eb363f2f9b8546a. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/NLB151100644.
Baggydog (feat. Louk Boudesteijn & Guido Nijs)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33600082ef56604b54c25830ed449abe4afd949dbefc16bd67e61db0d63c1fff. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/NLB151100645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce241edb94d781fa82baebcdea8c002e1a4666bf331fa83ef70171fce6522def. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/NLB151100646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd23fd78f5c8bf08dcb90a7b35fe1c99261d3edd6c8cbc0bf0e982df833c5a76. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/NLB151100647.
Famous Seamous (feat. Louk Boudesteijn & Guido Nijs)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x466993132cabbac8929ce615f18c11db541776e9e8d823b5feb36dbc9d64ead8. 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/NLB151100648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f2afb9c84b5b2fcb1da7c79a40fa12ec69908131df2c71167cf33ea67073f58. 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/NLB151100650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdad01c70f826dd165a89f1e52c0ccd93b140f85634357601d1973f32c815f12d. 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/NLJ8P2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66e9db4d668a7e356fdba67b157425cd6bf119abfd90acd5f3b700f91c43dcbe. 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/NLJ8P2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ee4905a26a36873391a731fef14ccda924cc27116a343079fae4fe84728a469. 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/NLJ8P2200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fa7de21fa95a837ab6b13a43ddbfc39073e147a6c5a2fc55279164ca268ad0c. 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/NLJ8P2200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5938e7dd6fb43f3504e2fef6d0bbef8b59633de2f4519ce2dfdf83e25f1fc61. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/NLJ8P2200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe627ff03d3838ffcc47ea8d1901f7f9168bd6e7e85111b7a91e9c61216101e93. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/NLQ930600058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4be91872b77589f83c035e009226220f9d0d81887330d0d61ce9c5183487f4c9. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/NLQ930600065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebef7d07e8899da7b7ce0deba0fb095003720f0befb554c93ebe0735124be485. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/NLB150900819.