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 0x82011eeb4a097a4ce959904394155db5a22cada6575dcf91f21a7347a172d06f. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/da69efd3-802c-4410-8d5d-403df0e88f98.json and https://artists.proofprofile.net/proofs/artist/da69efd3-802c-4410-8d5d-403df0e88f98.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 0x05dccf9e5db58bdcf7d1bdc817cff4fd24354cfeb34736c88491e47a0a9a4124. 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/ITZ682103801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x645420e4000e13cd256f7586fd28b14cbc72e51c911095b5fece989c3b0b9a28. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/ITZ682103802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x800ec0d66fe8fd3554ed5676c1cbb85403e711e98cf726b0d66679dab68a724a. 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/ITZ682103803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6171a0dae6cde0e809f3791f14c366fd8d0e575cddcf3badeb4c2d858ae4d69a. 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/ITZ682103804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeffa9b1f5ff8a3f9db6ea99e81b2c2fa13b0c5abd42589f4cdf12ad7426a540. 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/ITZ682103805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97fce320b839a14385340da4e88ade3f89c800192269f172728d38f65d542ade. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/ITZ682103806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf0b5813077ffbc84a4b03ca4042ebfc45a7298f48145e81b628e8d9d82c58c6. 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/ITZ682103807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffc19ec5dc6c5b0b25cd8a05d37d94b0352ae8405f97698dfb9491d709e631ed. 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/ITZ682103808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfed77a1427d8ba7da9cfbb615bb2e4ed97606f2acba39532d99d238d7481554. 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/ITZ682103809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb58e2ea85e6fc2d0aa3356a06c9f0f8ab662e05a35dcdf36a51ac7968c360c5. 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/ITZ682103810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15eb93f6360ed0e926ca6578c57357bd383905b0b8a4d59c30ceaa374032791a. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/ITZ682103811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaddf5f36cb19d7c5a65b9e2a1e44e914ebfa4f9e5b28e23f994453142bc2121. 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/ITZ682103812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94bfc36a78005411bd08a03493da736cde5b640cc048da44ab719356d507552e. 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/ITZ682303901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97fce320b839a14385340da4e88ade3f89c800192269f172728d38f65d542ade. 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/ITZ682103806.