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 0x1213d842a77d275587a82e2e92daa6a6ad3215c370060b54d87533ce132e2eff. 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/d6312a80-052b-4ad7-9e9c-b07cd23c505c.json and https://artists.proofprofile.net/proofs/artist/d6312a80-052b-4ad7-9e9c-b07cd23c505c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Bach: The Cello Suites - Recomposed by Peter Gregson
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 0xcf0400bbfc2732017ab16d2fa59b2baef6d9d7b66683db3870784526129918bb. 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/DEN961830436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfe0b322f5e5e1e52c14d1471e301bb725a66b743a638e65f1aacd2c6651ced1. 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/DEN961830401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d0063290e4d5d5edf2e59f68074d330e5994dc9896b1746bf1dacceaf41f536. 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/DEN961830409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b162238d2b5063abd9cd9939aad36db635d4f857e85813485c5f46df797fecb. 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/DEN961830404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d49768b73646e604689ca791bd20a5bc8c204d253d4270a4e9670e0b50ceef4. 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/DEN961830421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc571c3ee355a645fae7abae27ffbf0f4c65ca1cc00cc8e8c2e61f19810cfece9. 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/DEN962030910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc93e5656914a8f57d6967e33ac6546217091d3806d86100e26a129daf2664180. 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/DEN961830402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a2bd1b3e3857d0d08e02c43f9cff977ff767cfd09a0f73274b7d8fbcac13b04. 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/DEN961830429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa56cf4ce95ee4013a3bc44fb475c581c783ed096588d8644db86f839c608dfb2. 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/DEN961830406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c9a445f5e8766938a185893974b4dcf708409565f52f02d2b96ed47c19feb04. 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/DEN961830423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc43989b518be4825d3832aabebaf465b4b509ec8bf2459917d3b60762a8ea5e5. 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/DEN961830403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x138cd0456c8a98fe313c8b58a46f5b49e9ab248e8473540fc7854180f99ed9c4. 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/DEN961830435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x383d2aba82ce52ca2839f55328e2cc8ad8de54ec6f9c9ce0babeecda4cda1f69. 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/DEN961830410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6975918a24a844a759dd6ef7615fb2bea7b42ac93c5c343ee2d81b64369ebc22. 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/DEN961830418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c7a2d1dce2cb9095ac4fe58ae180401917afde4f539f8beced7f618d5f2eb6d. 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/DEN961830419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3334a9fe82137e7e394eca4801adf3d92e2c1e60d8c70a219023a730dd00641e. 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/DEN961830414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x781ad99b55c306f25e4d87ed280bcc70aa007bf9d7d30c03b5a64ab0ff08ea59. 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/DEN961830413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d644a2cd9043686606997d65af2411334c9c26e54fd8cad6929b9160b271c62. 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/DEN961830432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb32efe00e84451d7751fa4a8803e3fa20ad4a80ae6512fa170a60d2f0146ae79. 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/DEN961830408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32fb1f6306125029213d78d3cc743d12a6a2efdf04e536b55b3b6151712a1b49. 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/DEN961830411.