thumb|Pops For Minis, 1967 Kai Warner was the stage name of Werner Last (27 October 1926 – 9 July 1982), a German bandleader and musician, and the brother of James Last and Robert Last, also musician
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 0x6a7bdfe1e61e6c98de48791091bf44911694f2b96ec645bc2d1ea551fd33d8c8. 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/54a75343-1835-4d9b-babb-52496df281c0.json and https://artists.proofprofile.net/proofs/artist/54a75343-1835-4d9b-babb-52496df281c0.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 0xd761d2799f099fc9b7671cefc290cff0f40b4553d8f90583d16a5de195af4a24. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/DEXO52433336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ba6c37bf2f30b7f82a720f5aca07f34bcfc39b38a70274af778fb34d664525d. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/DEXO52433338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d802df2e9435b900d6f3271ac69f692743798294aa44fffacf3734c5fffbecc. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/DEXO52433349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7bbf6ecca2015e72a607906aa74b4aa19b4f13dc1fb020b9c2f2794bc4ca1e5. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/DEXO32236628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8cdaccf39b1633bc2824364ec67827d380e6677f7eb718816f12d5da6d5ec59. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/DEXO32236629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00f803f1e027b983caa619206e31ed56ffb9137daa42af80f4699b09754bd306. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/DEXO32236630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9c857668969f6518b7a48fb48e210c3c4b479e2f4293837a3d997617206f1d1. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DEXO32236631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9d3b2ae4ed2dda8f34650b9918bbb399175e1085cdf3b4ed6fb2e8b91da1342. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DEXO32236632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc919a359fa84b1a7fb3d0a3193f41a96f3733bb213851ba94ba2681e30aedc4d. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/DEXO32236633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a9fada3b7b5a7864ad9afa8b021a4190cafe4bcc16171b751f75e4e01acf072. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/DEXO32236650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa92c45ca2c9d4674997089ccfe88d6d389ee8f52ece7526e9fbd7d4588e57a94. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/DEF066917420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x501f05f7721f22539ad3a2123af79404c6d2274adbcbaf066be1478b150b7d9d. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/GBKPL1027215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc669252dde31c61f7865c310393fffbccd53003ee2c5e5744b63b2720baaf3a1. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T09:09:19Z), 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/GBKPL1027216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c0d9ec122ed031f93ae2f19c095a151f56a660b917e46bef90be096318927c3. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T09:08:47Z), 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/GBKPL1027217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x346820bd127106df47fe12102c87881b24df1222004e9c85b5e9e7b4f5d310ba. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/GBKPL1027218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x917c1306ca5bc9e97e0c8baa8e1b0fb3492e6c56c1bfbc9d7ec3cd4ce082488e. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T03:45:27Z), 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/GBKPL1027226.
Warner Plays Wagner / Swingin' Johann (Jazz Club)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c0d4483c464d695f931ad7dc90f72407ff206f6d738dd025b360c72ba09f744. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/FRX282238644.