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 0x7be6b11e9d9732c4a730294805c33fc265eaf9160c8e789b4321d3f63cd5ba5e. 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/ef037341-2005-43a1-bf63-7ce8633ef4a2.json and https://artists.proofprofile.net/proofs/artist/ef037341-2005-43a1-bf63-7ce8633ef4a2.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 0x55a03a34b169ad98e9c1121bf5c23faf462de51cb7241c9668d6be359d3833e9. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/ES71G2052477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b429db4ed4bf0981d523440c11a2baa37d099a340c9299ef5609f2feb815255. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QMFME2077331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30b62f87051be403393b7e0ba505e298d6483bde7ad3c31b63d0d9d88d43f60f. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QMFME2102255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f678cfbd7eaedb7d3042155dce290f2daa5832af56d5ec1b1417ecaf1a59bfb. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/QMDA62176610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9301ca3c32f3ff9958318eb11a9554e7a4648c63b3b13a00032ed6f216434f. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/ES64E2201591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe72239b2dd1726a9a45933e199a3b85277c441a63c3125e0f85832a62f248089. 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/ES64E2204634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57929fd9bf1cc8e3d00d7f05d0d8283fa22de31c583630e643e8b57a03117cec. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ES64E2301482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd128eb791225a2bf53bf32873c5f5f04650043ad751e932c0cac9e37729dcee. 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/ES64E2303912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba058caf5394bccf00640adae1de39d48498d08f21df2bf2826bc030df419d56. 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/ES64E2307897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ed7ba6c9d4f9c6ef31babe34ec27725a623489f752cf7af5b03e37b9b2131fa. 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/ES64E2313070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f7b5cf2d7aad67cc7a6b40a1ac6e5119179667ac80d20b0eaf3d1144549cac9. 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/ES64E2332462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a06540d9e5aae8a696ecff60e388754cd3e70cfcdf9db8de87e48e4a7dfe9be. 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/ES64E2466910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe43350c3c1adf3cc10e16fb05c83406680179d5548abfab75309993d42270968. 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/ES64E2476761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x788318d5b85677bb961eb5577979abedda88cd8170bda7ecf4f346a8a352e426. 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/ES64E2484973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46e01d2d780ee3764120480d6b0b7c4d12ff01192cb7682dc20c393f5a48dd4b. 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/ES64E2403471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd600f99941271cc14e37fec6fdf28f51c74264f4083c78e36bc004bb5348fc92. 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/ES64E2408529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5d86331b0a73330d3ac833197b67a70e3b98d246c90449e883c43bb62e47004. 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/ES64E2100021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5d86331b0a73330d3ac833197b67a70e3b98d246c90449e883c43bb62e47004. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/ES64E2100021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd926c587bf751528c9036c333aff4346ef5269d85ef6c9ffd6080bd0d2f353a3. 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/ES71G2136198.