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 0x1f0b2d8ae5f8568f113711d6b8ec4147a64d476dd33753689274016872426053. 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/03d7de31-59a1-4627-96ff-4d43aa83a5d3.json and https://artists.proofprofile.net/proofs/artist/03d7de31-59a1-4627-96ff-4d43aa83a5d3.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 0x6ac9a65eadc2422e6fda2e819d6564082d4faefecf23cc2e8abb29cb8a8a5142. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZTB92249853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d394d982399f8d48dd426f8080cd2e5174ecdb45720bc8631610b2f267afa68. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZDA42348903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd936af304492d7894312e70d5a5186bc477184794000afa7da77ca155d25ee75. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZDA52348557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x633b7947cd3a69298edf7bb61d758b0e8940032dbadb00074f2a0b820aba859c. 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/QZDA52348559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66a1ee94ab29c2c1484d28c3f6f3e5d9d7b4de2b546c997c1f213db9475442a2. Chain 2 (Bitcoin): anchored in block 958573 (2026-07-18T15:49:54Z), 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/QZDA52348563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ae0fe052c7ec82e7e3af753fd8983b3669fa11909098b2d24ef1ea69f611b0f. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZDA52348564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf756e472db5273601c24663521b425237f29e64510ae1e42aa9e30c20017e863. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/QZDA52348565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d878e0ac0b76113b6174fd37d5e2026f4a1389abbad3c1c80d0617301da5ac1. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/QZDA52348567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x704eee2d676e378a9971d01227b067f6da4740605432b82226eaa2a72a191e9a. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZDA72388771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd18af87217187b8ac16eda1a20928647e9f49c8685a8725b63c9aaad4ac86baa. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZES62378288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd0ec805c6e0d2a9fdb2a09eab6cb3991e074bd864ee756372e34df0519f1334. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/QZES72306835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b6bd8f750b03cd2a7ce68201562d2475232f7285efca010775c44b47962ab4c. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/QZHN42374728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6abc13a11692190d8c41c5e2f87429163a831665d3c899a885440472bf610e4. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/QZHN82399769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46e383dee28247b19b0d03a0951e0ba06f8ec21d857c043ff840fb7c08d1a56e. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZK6N2316057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x589b7aab24a48c5c9bc262a26dd50122f64e1bf8512f5256563dd4c824782652. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/QZK6N2316059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x590777401e6419353b378f450b6f422ed8148faf1c3cd02b40951d8ecdabc904. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZMEN2332423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf7077ba8726a50b9ecd5dc86262339a5ff153bb41d9eae4e6bf1d7e381eb1bc. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZPLR2314685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd713a06d216b774f8e8112007577ff58e38abad82042a4b0ddadbaba5d7d7cc4. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QZPLR2314688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49c2130c62557b9fcbbc893e6895e0e36be5ac57694e880a498236f68ab8cd46. 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/QZHN52458556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x487477b22a020a7126e2aa7252f5a329cb72e6ac017e76d32d0238e23160b897. 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/QZMEM2507380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fc42ddd078468036a16965520e836d6a83eaa3d457fd5a73cb659cea4b57141. 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/QZMEM2507381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcce5c2745085cffb12990cf079f188f422b46bfc6ae4ac0075b823d0fa663f9a. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZZ782577259.