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 0xf874a88fb95fd5a1025f3535ae5bb699d4a29218e04eae066ef512acc281a4f6. 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/fd67f19d-0385-4f7a-a1f3-9b8384cf4f65.json and https://artists.proofprofile.net/proofs/artist/fd67f19d-0385-4f7a-a1f3-9b8384cf4f65.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 0x6eb540bf55499bd1371d65327d8ed0e137d9bdd93df2d27b65e2595c880a5675. 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/SEYOK2005937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x768c5cf30f027780606e9de832bd2b6e3c82fd416ecc0f3bba515a867fccafe7. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/SEYOK2005938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b211602fe69b5976990de37317e96e610aad79cbaeea0c24d7b825f55a5126e. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/SEYOK2005939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e3e71bdbd76d5bba59f041952fa0e8eb70f9da0c0fa1c395fc1f92272c9feb7. Chain 2 (Bitcoin): anchored in block 956775 (2026-07-05T10:41:06Z), 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/SEYOK2005941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x522dd821b946e5a2ecf23c87a82978cfb894f689ed8793002a8065715d12a410. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/SEYOK2005942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36bce575fba42cc80359928aef61031a90472e24f469420c7fa23ad6d9105a82. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/SEYOK2005943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe67413636793a6635893e8040f93be0e54c91b55deece19952c07c7021205877. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/NLX1G2200280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71a9cbf1cb377aa1bd7bdd70919dd3e0caeaed5534c955b0f233f78696ec19b8. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/NLX1G2200281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fceda07e4321c1fdd46b1dd484d09bf8e9c5df7a222cbbb35e59e84b11789ce. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/NLX1G2200282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcb3fe628b324f9d92e9db8f11902822e30e4280656aa4d33d201dc39222acd5. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/NLX1G2200283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf574a13c4e56e05120f2f3fb02c5739b092aeabbd40c7b74482af73cb7d11b56. 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/NLX1G2200284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67d2bd384b99c4b1ca4a90d2985197bf4227a63fa8d133105ab589c846cbc4b5. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/NLX1G2400358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf24d42235ce373609fe771a6aa7911a7b5f492114c3c1a2a6a0e865e0690989e. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/NLX1G2400360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b0ad1f5e0da7d2a1f972707c6d9047561d7f6e2ffb96a38b81efa542b32ae27. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/NLX1G2400361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa49fe0f5dcdd0d76f95c2318408eafbf47a71b2d56887429a03b3a8454b8a910. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/NLX1G2400363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x806fcaaf293f264ce29a4dddfd0cdda03672facd726bde7af734e16e0179789f. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/NLX1G2400364.