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 0x4656fd10f9ddedde1b2c2c516a697963ac749fd79d0f60aba575aa6c38ca5643. 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/a43c4d63-30d8-4f9a-82da-b2bb9fe96023.json and https://artists.proofprofile.net/proofs/artist/a43c4d63-30d8-4f9a-82da-b2bb9fe96023.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Cello Solo (Live Corral de Comedias de Alcalá de Henares)
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 0xb177d15891547a3c5a90c57123f0979703f4eadef3b957857097dddde823b6e6. 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/DEA892000140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ee7e67e85c8e3745aa4270facacd2d50ff2ccec7c9378eab30457e2bdfb2606. 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/DEA892000141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x603dcc81ccd8340a806fb7096cdd43910ae2cd5670e8dfabd683fe0514630c62. 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/DEA892000142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a91ce233188e6e89e251f0f47f2d47d274c624a78c7b41da847bd5e80b27d33. 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/DEA892000143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f33a7619e1399dad17f3519d0a1f78dc106d81bfa2fb10551df5ab29c079ad3. 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/DEA892000144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe311a80b7a25e5f4bfaa8a0582d4db0c9ede3ee3546e2de737d3b9ef228b8a2d. 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/DEA892000145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaa65484d98bdc510108c85397ec5a214853594fc1c961cafb70db9e4f01ed5d. 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/DEA892000146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30162e9be592d9aa787eb0895212cd81f31bc0780949a7357d5c8a4a7897902e. 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/DEA892000147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ff499786dff7b181cff800a24a4e6275f8abac5984835e4160f9a64393fde13. 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/DEA892000148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55367b2857b86fb3db1c807849ddbfbd53c8214b5db954af3c36c66fb461a5d6. 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/DEA892000149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x260b92e1d3db7436feac757e8d709e76e70cb962e8330ff3ac39834a0badad47. 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/DEA892000150.
Matthieu Saglio Quartet & Guests: Live in San Javier 2021
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x241eb41eefc7850ef84d7faaeee1a9c14f36defc8343b2212e63024b87391f8e. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DEA892300140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e2fd2cae40ac1bdaf4ae1aab899a91beafc1db428ca1bdb85682472738145b3. 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/DEA892400586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e2fd2cae40ac1bdaf4ae1aab899a91beafc1db428ca1bdb85682472738145b3. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/DEA892400586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x612dfc5fbf7444c3845972c14ea6c3b4cdc73f037d89405cda586946a23a143c. 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/DEA892400587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55c437f26d566701a038b47460857e5853bbae1d38a1095c4387629cc1cddae6. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/DEA892400588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29049c7cc1c2a7137245cbdde8986c15d17c76cc22ea71ca945be0f40dcaec3b. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/DEA892400589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa31da73499cd738fd7080608f7547cc91ae472db2f24bb653f7787e3521e682b. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/BER571400106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1af29fecb856b19dd09d790dcc5846d45052487fe5e96d8887838fa3c5ae169. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/BER571400110.