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 0x7f760f64538ccc5907a6900dd928686c4d3e97a1aeefb3f9bae091fc7e42961a. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/947df850-03ca-4182-98f1-03db0a9344fa.json and https://artists.proofprofile.net/proofs/artist/947df850-03ca-4182-98f1-03db0a9344fa.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 0x2d34ddab135c0d1795e948d019abc301e8a6a33558527fa59318e37ee72c23e9. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/UKKEG2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee42691f019007d68275ac555d585de5f598346efd7e8d67185a9d37b1ac1c83. 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/UKKEG2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc187aab7d42562be5520ef468e9a2cb97b545095a82681a8dc1f985024ef868d. 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/UKKEG2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x821c3784772b7c7cfc067c5362b86eeb2bf827c60f0d5c565f237e5144d00f7f. 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/UKKEG2000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18f15fa3dbea48d60c190f42141321c0e2c55d9b427a317e77ef8f0c8d001e78. 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/UKKEG2000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0b0707e99fe9257e9bbba14dd569b256ce2a2e01b3d9c384f32a7596434f00d. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/UKKEG2000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x749f0477cb274984bce43bfa7966fb7a6a725f6b0548eb5162f24afc6901f275. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/UKKEG2000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe53d8891764ef2076293335360f8f84254b896264abc076a0e53d3919013e29b. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/GB63J1500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa01e304977392f0546f5640fe616d7fd0236bc359e5944d0def0ebe4caad57e4. 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/GB63J1500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x899f73ee031e3d8583155ca631e936d0925cc0f05c2256c754a1e34f5169e196. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/GB63J1500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x312374c2e4e07d47c9b42c24228468ce159efdadf203287fcbf4dd4cb1ae5805. 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/GB63J1500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbf3f93c1b010b3118521388d61b446bb471cbac15aa0abc47e36ae830a267d2. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/GB63J1500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddfe27adc823621aa6e5252d1874da86dc02dac8af74afa7a17ac2c23ffbd113. 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/GB63J1500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe493017091a9b28db194a87ffd134d15151d74c8f991ad9299300641ca9065f9. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/GB63J1300001.