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 0x039f8e7449d3e9083f1c25a7671b67d9789b6ec720e77a8df811cb95ef70b271. 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/7dd8bb7a-14fd-489b-bed3-c261bb8ad926.json and https://artists.proofprofile.net/proofs/artist/7dd8bb7a-14fd-489b-bed3-c261bb8ad926.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 0x045e11bb36de3380f12b51ca938a5193f82dcec172315df57f29905b8d3d2b65. 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/BCHTZ2300172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x361fbf245454bdfad7f1adecbbe52114447132ef149073e2cb2bb9f795a57477. 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/BKM2L2300186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00ce4889227f4d8c8913492d57216be060577b2e7d076e823303d2ae2e24bcdd. 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/BCIOS2300030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b8d52274d06e00318519816081de917a6cb1e65126e7ba9d2bcacb6bc085080. 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/BCHTZ2300124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdba0241235274f5e58e9e684b1ebeabdaee32dc5cf8dc7897fe20400335a93f6. 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/BRIOQ2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66af104d853a7d033aaac055d3d7a11906b188a9bfea0b5f4da453e3e38fa18e. 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/BRSME2301160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9dd54486bd1433b3b81ca868eb4aebb7be693e8d39c4383b5f1f0814a3dae03. 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/BXIV82240730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9309fc6b8deb24158ddb0d5e36653ebfc0056d42e89ebf95b548ed003d6e555. 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/BXIV82268969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4474f6842a67862c741625a9cbd3a734acd3331dba0f8be92fa1e43f1bb983ea. 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/BXIV82216305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05456ba5607632ccd3f93fbd7b8b757cbf6bdf84e5da8d0ba2f1046ce476c7af. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/BXIV82258398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x028fa7cb3aedbc10b4f4a157662272607894f8924cf475e21cf55552bbd6b98e. 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/BXIV82229855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6a2e3df753ef09f95cf7ec24deff02c398274d85c6c919ec9f6441d43f3d0e4. 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/BXIV82241554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcef89bb9487858d113d75e579b738349cb42f7b9bd19296a36426340c003d298. 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/BXZYA2200028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94f37d17f3e9069748a9c000bd84def9f7c4a67ad51619da4684bfcb00e5456c. 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/BRSME2200712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc638e9378036ad3fab74575b660124ef1b9086002ac6450a3eca45fe8d97f7c0. 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/BCIOS2200015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78017a18597ab2da22a40575625aad89fc826e27e587d5e5ad94713b4e7b16d2. 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/BC46V2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf00b7584e6a247f528bbdd904eb934c8ac3c0c28c19124c89545afb6f4de70a. 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/BC46V2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x496f9cf593aa07ae6ed9eb6c1a88735777e6b2cb1f23a1b54027ef4c6cda01a2. 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/BC46V2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ab5795d89213f66945fc5cbdc25fef8a66309e04f180004168c601a22adc63b. 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/BX3AW2200062.