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 0xe7d4cc8e2741f10473f3cc7e40c1f97c592c7c832b15e44cf36d5006c310e78e. 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/3e61322f-ed40-4758-b406-d232fe61f02d.json and https://artists.proofprofile.net/proofs/artist/3e61322f-ed40-4758-b406-d232fe61f02d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The Copenhagen Session (Håkan Broström Meets Carl Winther Trio)
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 0xf7559a09cf5df63b17bc0585790e11532d0aa02f4c13b07dcda92f159744c7e3. 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/FRX872133486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0897742d02b18b9b4d369552a2d496cca5c28f7215b5332148e5f9d1d2a6597. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/FRX872133487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d4d22c0d7c91b10ad503627521c69c465631f4698c93592cc5a136cae91323e. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/FRX872133489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8ce0320abab61f31a5ac5cdc8ea65e7dc63e183c0ba10451cf363af5bd2917a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FRX872133492.
Lovers Moment (Håkan Broström Meets Carl Winther Trio)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50f3d907950b1a0c4c2965990bd47925c09dcc2138947c6b6e36e2014b70f132. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FRX872133443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x783dc846b2d6285dd6667bb707eb2f4a7c01932de7b765f0d94431feab4bbf17. 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/FRX872133444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7b917701793a0db3483636b85f526f88cae602eb0067426ace9fef73cb8de6c. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/FRX872133445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01f07f6b0e3cd3c29aefa85842177e84fa110b3dafa15f56c33346d5b0119eda. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FRX872133446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dd6615e1b2b3d2646252a9683e94fbd1f032ddbfbcc08f9ba103ab23f12942a. 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/FRX872133447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4c7009ae190567972a6372bb01d8437aa0b2616063455310ea96d6935f939e5. 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/FRX872133448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa4effa57f047019d87497f062fd5e4a6f34e190a6aba262a698572d3196dc47. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DGA062231783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2662d8278f28386518766b3ab6773bd13493f5426f46ef7baed74e1e74f9ffa2. 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/DGA062231801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8db55f4cc5c19d862e09b37f8dbab3005cbfde7ff13042016d327beedf50022. 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/DGA062231804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8097193bb204e978848a027393979700a84df1e733bb278255fb6369a8d0eb18. 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/DGA062231789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fd2a6fe686b18346502a91ef0aa46cf80f74aba62a55806571a53b5f10c37c6. 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/DGA062231790.