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 0xf3301e78f52684f49aaa36af79e7bded1d44595850e2f3a88373d1bf9e4a59e0. 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/5bd2cd74-118e-4f82-b780-50c9edd32629.json and https://artists.proofprofile.net/proofs/artist/5bd2cd74-118e-4f82-b780-50c9edd32629.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 0xa9be57167473476270896014a93333075849c6221ec5519a6c77bde91f20d58c. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USSD10504178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ae633a1ccc49b37f677c9cff5fa97a3f315fd069f96d1b18ade254b2f7c121c. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USSD10604136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x298c87c4a77f80562b5b7fd8f244eb8bbf11ca7900e58cf628fb091f692acbde. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/USSD10604141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb30ad445532ec7bd4ecca409b911ad9aa5c905e6bfdc0f9d99daf2065874b6f5. 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/USQY51734242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71178f674ff8014bff0856905f58f8e156464bc9aecb60b1c1b166ba48831018. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QM6MZ1815482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x683caa096c5f136f783908a6af25024d587688fd53dc30aff4496c133b3a2af5. 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/QZHN42047498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0231434e4fcc07a31ba2052294ce30c6a3e21872951b67a5d2248f9dc50d07c3. 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/QZHN42047502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8578e50df62b6e94274b00dcac299fc10e8f21c5ec5d05c3e64050cc22682ac0. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZHN42047504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd330b76baa275b9dc64059860c30fb0069d5ede2f76371cea316256f2dc52cec. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZHN42047512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3266a5b86603bc2a2f77e17407f2ade300986a36001db7132f864843fb392e99. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/QZHNB2085808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0930a61ad5c8e46e0311409b7f86e9ca5094003a9bfc254e7e843c92f9b7be97. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QZK6M2081724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x445370fc949a91a8dda1912f366b42346719b2ad5f576ae697a4f8000a9c11e1. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZHNB2273103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b6512ed7f4772f59b5a7d7821d8fd9d9be47cf31431b3e81dc080141679b701. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZXPW2400048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fb2d4e7e88a3889b3afcd52f57e664a11ba76f99a7e4ad3b1c7e415b4d9c543. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/FR96X2532190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab1e97c2dd0dfbd070f4ef8d6a06215b37f74c96e12a00fe3be94045ea344033. 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/FR59R2573675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x714ad48c8272b62bf7e606d14131a52d0dd4d90e74e1bf510ce28a5c26efbf01. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FR59R2559633.