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 0x16d50c4b124b3233ee7375de01b28834a943fac91c68419da900c7c385a3fda6. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e8c6b816-00af-496f-996e-45bbd55cbac7.json and https://artists.proofprofile.net/proofs/artist/e8c6b816-00af-496f-996e-45bbd55cbac7.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 0xb2c5d0a6c2a5359ce202e66190b3b7cab05692d45041b9f2779306e127ea1925. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/TCAFL2107984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dfff10caac4a1dc938abec8b3262337e14778c88f2d4e36c45ed2b8ba972c0c. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZK6H2214314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8e59c97417e4d7c80c20005d3e94a085734138a587d75d7f98d45279c78a8ab. 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/QZZ762456429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70be78603d1f97475ce2be53a5e33be662ab69c217b33540a1d06e9411af60b5. 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/QZZ762456430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3056db4b02655e2f704098893d873314172000f8eb5429f18722ba743421072. 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/QZZ762456431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00a03bc4529e3e5f76781b9c0d886bb401f97f1fab2b4567d1ff04824e324852. 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/QZZ762456432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd5a650d6c17e612ee2ca6a72cc7e1b49ee329b96db862fe6e7aba41097cf12c. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/QZZ762456433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf4f8a4131c448c43c67b6aa05cfdca9db893ac7f5e48b875f6f3f1ceca5c115. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/QZZ762456434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37d1fa12bdb3b619ffab6bbca3c6a433156ef966b87e570ec8ee433795f1e015. 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/QZZ762456435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91dc880f2dd06aa90bb8ba72baf559283b0321a5c50ef04f0f14783e8971aa55. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QZZ762456436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f6c40bdc8d24a37d9b5b02433e5f8cf0fde208afba5b65528e2b49375e50df0. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZWFG2314534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a6da1c92935df9798612ff69f27f7e47a0d03afad0ff30825c26b5cfe2ad0bf. 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/QZTBB2245020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x050c54a34439f9624826b3e53e7765ca184ba7bd8261608dc4c31847a484e531. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZNWS2397265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4888d32e358c82173ec56e991889fb8d58b58d9a89df1c5175f1f50c1e40b8c. 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/QZACR2100366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafe41265c5382b99401bce914b180952c24b54e38870e3dab5e7ac3d229166f4. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZHN92246604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbf176a7e0c7a4066570abc0b88446c56cf1dd2d8b5e887a5c2bc454509dc9d8. 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/USA2P2252231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe061208ac0814e7c7c17c36f0c9ba6f5ba4cba9b866ef2d7284b350be8257fe0. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZWFN2449951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x050c54a34439f9624826b3e53e7765ca184ba7bd8261608dc4c31847a484e531. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZNWS2397265.