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 0x662441d52e309f975a76d349aabcfc7d1c9898a325ae63c3be08f14994d96f6e. 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/16240457-973e-41d8-b42c-cdb188281a4e.json and https://artists.proofprofile.net/proofs/artist/16240457-973e-41d8-b42c-cdb188281a4e.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 0x1056c1b37a3c5aa583ebb34806d6e4dd614aeeb6ebacaacd81f88dc40b4f849a. 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/QMBZ92184057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac33db7d2cc31513d4a1c39e6765bc4986f6d42ab6f272a44224b39e1248d81b. 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/QMBZ92327599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd968bb33d6552d507403e601fcd20165fb75aa9f954baa9f46189cd5e2f2c753. 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/QM4TW2315986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1b9ff663653917c6ea2466dc88b67e9f355e873a2bc4d214a9280befc2b645c. 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/US66W2100621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26710cf9705630e6bcfc68a741825a87bad7e447955f23c7851e67d8435606e7. 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/US66W2101701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82b058f96856607ed74f1bb8a1c8d82dbde475cf7ca56199b33ece6227b13d88. 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/US66W2101721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5102387ac68080076d3155652d3e0917d6ef452bb3a169fa4db04f912bec14ec. 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/QM6MZ2165524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb1bf3930db3686886cfb9c02ffbbb19c399d1aedad9fee5a0df92c42fef9f0f. 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/QM6MZ2165950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf454d044609c6d9d1dc1ef279e9dbf2e14b422a035ef1c871324ac9788a0842. 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/QM6MZ2147245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0baf0d9b95a44974fa8138fdbe69ddd7b64d5bff7fc319b30a112e59837cc89a. 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/QM6MZ2165987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbc587f5a2e3d272cbeea01f9507dd9b1a9bb5d02fb19eaa32f43847d79258fe. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T10:08:59Z), 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/QM6MZ2165545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1457b5bd2e6932c2cf8c6bf7348e66bea458d4ab018892614d4b727100b859f. 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/QZ5AB2481321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb86077893ad1f1800e18994ba981dc372d9feb0914864b62e70da236699ca759. 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/ESUM72301483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e159ee695e2d5c916a852b62fdf609ae319343d6f9051fe9a410eeceef4a977. 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/QM4TW2317029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82b058f96856607ed74f1bb8a1c8d82dbde475cf7ca56199b33ece6227b13d88. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-21T16:59:26Z), 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/US66W2101721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26710cf9705630e6bcfc68a741825a87bad7e447955f23c7851e67d8435606e7. 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/US66W2101701.