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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf8eaabc4c24fffeab7c36ec798d032c5f4566a1571fccdac1b655df37a5e09d. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d1b770eb-e1f9-46e7-9313-4087312439c3.json and https://artists.proofprofile.net/proofs/artist/d1b770eb-e1f9-46e7-9313-4087312439c3.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec64f327d09ba1a691407df311931b668b166940eaaeff8d176733a25e73e24a. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/GBWUL2072566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7bb5f7e4b0cdbfa0a8ea6c764cfdd8980e04043eea5f54c2d78d964c14097a1. 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/QZ5FN2043763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef1c360663319827988df913da3d7adf13bdfe1a8aabd97950605e7b6b071ebf. 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/GBRKQ2176555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa22910be2f3b9c007a20cf0c1a22085b20dadd59e94ba38f479e55824b536ea1. 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/GBS5E1100298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b129e23365fd67c9898645bdc3c0c343d39b90566d0290d6aae59585eb1d9e5. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-21T16:35:21Z), 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/NLCK42227762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4b78c4670db0552687b2158b29636b9b46beec92f4c5a5ec7f0950983bf3912. Chain 2 (Bitcoin): anchored in block 958819 (2026-07-20T06:50:28Z), 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/GBRKQ2454130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e316dad838733c7f4ac3b22b3919c035957099b0162fdd2c3e92dda7bd666e6. 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/GBRKQ2454134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x925d57784f36e2b9d137c9f692b56329c9d431317ec0c7352d9dff86752f5192. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/GBRKQ2454147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cf5ef94cdb05bab43e3e5a0db361d3437144351aab52f16d8259aaca2fb5327. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/MXA3V2430738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14a6162fe01757323b9bbec1bdbcb01ba815bd4adc409e7c03e6b0ad8a5ee8e8. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T07:09:03Z), 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/MXA3V2430741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x804fe18061d465c27a614be76081d8200e2004badcba079430beef8730da213e. 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/NLCK42229083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b129e23365fd67c9898645bdc3c0c343d39b90566d0290d6aae59585eb1d9e5. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/NLCK42227762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd574a812fe8d6b1182d4e8327f6a9ab59ff184b93e30e627d99f7691f9f7b387. 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/GBWUL2200685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd45dea20f88e77bbc95c2c655747338d0e28da599ddc69f218fd86c7ed77f9c1. 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/QZFZ72343766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x629425916dc1d86b6f88a02858cf270fd38718a837773726c27de9ecfadc89b6. 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/NLCK41071277.
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