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 0xb749437c54ea0dc624153b2e1610555dd66b76783d990e0fb9a64d24b28c3758. 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/dab69b17-b7b7-4786-8874-ac3b971ea13c.json and https://artists.proofprofile.net/proofs/artist/dab69b17-b7b7-4786-8874-ac3b971ea13c.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 0xe0533f80a6a5a0042c8d471dd7e3af88d804d94d687024123b554b5e29ab39bf. 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/QZWDE2238670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96be9beb12129b0862501e5c302115cc573585bbb6569a4a3a9d0a4152e3d856. 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/QZTRX2270923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e27d82cb6752566173b894958ee66e71acc5c2645ac7cc8447dde7fb78c2448. 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/QZTRX2119335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ed355e046be9784d0d84a2b25d738ae85ece85d0142582ce1cd31a26369e589. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZTV32435850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13d010ce61e34c6eb5bd7589fce4ee41370445d57c393e9739ad771a97485929. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/UK2X22400422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b68e3e7191454f7cfc8064092cdbc21164aecbfbb8384804fa019b94a0002d7. 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/QZZEC2302613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed07f2bdffcfce67208ca213b3b8d808bdbb189d7a7b50a0f8d4dd9b9a9b1c5b. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/CA7C62300989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8d32186fb99386b4ab63e1bffb2e6286c1b9bbb0b7d971441659488159ac704. 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/GBRKQ2224613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9801c365679764fb4ecc9d45c62ac05952bfc4d4e19ce86b2c4b6cae191f208. 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/GBWUL2126108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d8f0131bd66445aae9e35944c868ffea346f4db263f448287eb39f6a886b57b. 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/QZ5FN2193481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7083d7f8635a652a1415958aaf9d54defbd9cb0933adf9da7d8e1a65c5a8c524. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZ5FN2193472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a29e1ea68e4e8a910c4451070dad186bbefa3c0d283e2ca7717d2d6890695de. 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/NLML62100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30d0546c81a91d98a44515840fefecde384d99031847fafe0e14a67846e75bcd. 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/DEN062100557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8662390c903d1f47620f556c1e9a7a203ba97a56a22611ab98348bb903623278. 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/DEPI82219685.