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 0x6e1ad0bc9cf608df11eea605e84760bd2df2e5b34790a28977e36052dc832b76. 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/67363484-af92-482c-9e88-ca7cfb5c56de.json and https://artists.proofprofile.net/proofs/artist/67363484-af92-482c-9e88-ca7cfb5c56de.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 0x5595e331b6c771eef8eeb6b6d7370095d2d0e4fbf81fe0ff039f24459297b75f. 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/BCSAQ2000020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bdad12d65763f3aab9106272a2ef69c6650c75aea4bb49ddb7a56270d94cd0f. 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/QZTPX2395267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb87eac26f3eff8008bde17185116d132e1d8fb9bf7d0a3a5c50c4334f7a4e710. 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/QZHZ52000053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2619fd47d64a120ef3ea2b14994809f09d172e3c8ad0458a87dec803698249cc. 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/US7VG1729137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffc55b87e79118d2d4ecb34445867b9f8999629061731d43a1499b6c0f7e5b29. 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/QZ5AB1795062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x008fcc2c6a245cc0a3f7a3e591aa59c9212e20eff9815aaaa3dc821c4d257365. 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/BXWMU2000026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fa533f7b63060e229392587dcd8a3bbb06fc7ba76f36ecca2d27c7232b8b6e2. 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/BXIV82303226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec5d9112db64d42b5a1b7adf4ca8edb3bf2327ceb5c4aec64c081b9cbdd5b15e. 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/QZMER2032793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7537cb925338d1c5df4f9faa34263765c68afd497f40043218f339e5a1ec9acd. 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/QZTVM2218764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc658b63c2535baab092aa3f82bb6f7053ef6b43eebe7cccbc47545e5506da2b4. 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/QZTVM2218765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51b95aa7d24a18189670ae2cffbfc926eec8f8359e7156e45072d4588803a833. 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/QZTVM2218767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40bf0f87a07d1df4b0a7b64b9102794060508c48431d0b5cbfd4cc402cd1271c. 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/QZTVM2218768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf833a52fcf31dbfabdb8d3171bc24cce2444cc4658b38555bb5aa17d2a0c5b7d. 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/BX35N2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42a919e7a9595a99e5c5eee8a9710af5cfb29f6e7eacb837dfc6952cdf0ec4da. 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/QZTVM2218769.