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 0x57c3790b92fc88feceee306a15b8e254ad83e02a32a2f52f055cc53f9afb43c5. 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/2dcec3f7-24eb-4fe2-a8c7-93551426982f.json and https://artists.proofprofile.net/proofs/artist/2dcec3f7-24eb-4fe2-a8c7-93551426982f.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 0x0e0b732d5d8dbc004f0622301cd6b3d92f9ebd7ad0ac4433274f72d19e6bba34. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZFYZ2074403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa9c2fc810f11e877afe14ed1f06934f78187d0ac4eac195a906029c3ad9c9be. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZFYZ2074406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdcf2c8b0a36679aae37e1852069b7ed20dd545ac13be15863621a244a191f91. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZFYZ2074408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe708ebe8b2137cf451cec9ff8e213b1a776170068e991a5c09d45bb78c29dd5a. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/QZFYZ2074410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4312d1a180f0c3944d143dd4fee21f36af6e471acae96aa3b10ff8e9132eac3. 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/QZFYZ2074416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94ae50c262c378c50f4ef40af4b8275a382cafc67b90624ca1a5013751e1f645. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/NL1LE2202592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01dc368f09fe7eb0e9e4c9aabbf811f2526c87408a3c2c92a726b79d82b8ac10. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/UKG8V2500145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb73e8619733146d00814addd568fa9acff221d4eeaa54a81db1c35277d687a6d. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/NL1LE2000577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0cffa4f1bdcf58584386e27d190eb79d31cde372a2a466798593958a4410f59. 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/GBKQU1978837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb73e8619733146d00814addd568fa9acff221d4eeaa54a81db1c35277d687a6d. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/NL1LE2000577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4531309e13d3ccd75b62c72bd89e03cc3542d74086f64f6e138f8b25d7e6f8f0. 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/TCADH1737822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0cffa4f1bdcf58584386e27d190eb79d31cde372a2a466798593958a4410f59. 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/GBKQU1978837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ea66326755aa1f55cf947e300e5e24bb47e39def6838d20d917f2ca4f9a3705. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZAKB1910671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f2575f922e8fb1f0356ea77cfff1955b74fb928fc82e6a84eb43eec229a38ee. 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/GBKQU1871792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f3f0b6baaa52c02dba1f7f12f3b22e853185c80210c69d957731e2a7d7c35f3. 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/NL1LE2503712.