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 0xdba1f4e05de87324ce0ca5cf55e85364759e2f9e5e84fb5ac80f9154a0b7047c. 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/9f68379c-08f6-4ae2-bf1d-2a767f9f3437.json and https://artists.proofprofile.net/proofs/artist/9f68379c-08f6-4ae2-bf1d-2a767f9f3437.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 0x4d7cde01e05b944ded3ad6e142a8586d69da670d421a2d1101076c80aaf6fc0d. 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/BC3PG2303107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6d32c4b3860bfa74da3ffbed0ce62caf51fa7b41ade1286f1966e59529cef02. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/BC3PG2303687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d8420a30a7b9e2a49188fa12b88a89cb7f9c4c318a220426cf77a41c03331cd. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/BXG6R2100414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89a7eb23615117da2518ca518b2e1b3bb3f5451143049d770cce6fc1daca774e. 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/BXG6R2100158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x665f6d6b524b4804d967746449e5f302e71944c9537073a9d446ecb8b51a542d. 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/BXG6R2001462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aa9d46a84975a771d5930d949768a1fff07828f6f4db25a2232ef32787b857b. 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/BXG6R2001430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30d2f17cddb63122113e0dc9ea099827e4df7d829186f8675f31947d491a7262. 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/BXG6R2001324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35cdd4cdb53e4a8dbe09bc5952eb14c6c4319bfb856df776c7506ff6d35f8e0e. 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/QZW9L2390320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48377c399b7b075c9254f55c6e1d961f49e0a7af4640885a0f15be2a20d2ffb0. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZW9L2390321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d71267282bbeb19773b5193fbdc08d96c3c0d3705f840a8be81c9a6a878285e. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZW9L2390323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8bc0af954a834ceaed023a7faabe846f767f1196e4facf31412be78a67b8ac2. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZW9L2390326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05d357ff326c528aeb5e494c3f4ee07525b3efb66da285d4e50df17c225a6863. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/BR4SQ2100021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x349971c8a0fadc247a82d858a58989cb264e41c64adfee716826f3ca4865b67a. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/BXG6R2100965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x797aec2e370b0329fce032d4090c179e29009b25430bc4c30a00608f8e44b389. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/BX7P32200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d51ef332c50336031851c305dbed890c34756a0376097f269559992ca797158. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/BXG6R2200298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1adc02095d5ac4ec74ed42cf6f2a1a3a67b8dced99275a5c0f20ddd4b6f88e1f. 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/SGW502290051.