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 0x287ecf0daa48537c21e366600b07fb73eed7bf416f1001a33c7368dbf39f7c76. 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/0d078082-1d43-4cf9-b8f2-b374237fc478.json and https://artists.proofprofile.net/proofs/artist/0d078082-1d43-4cf9-b8f2-b374237fc478.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 0xbf2d2b5301d502e8bb1e7092b139adc6d046803a98b137b437a44c9a8dce534b. 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/USUYG1339577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44ccea1794dc317ca651c219512cf2956375d03289536fb22bb65bb1185b76d0. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/USUYG1339578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd4a2134e5522032281483f7ac033196e0bc02060172aa392266a559b38bca5e. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/USUYG1339580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd823334f438de49a7e481b5a108b314197e145388687aec47b7baebe15b57e9b. 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/USUYG1339579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b9bf58fb9fd326b9b754b4a77d11c21a1e4110ae992dc9df3d7e50b1b02bdad. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/USUYG1339583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x799957d7f4cc35c877d88871be1e4299ced1f60e849ad0a1172a4615f82ba712. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/USUYG1339585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28974b126ea026e26d4af6e7eee6ec5b1ca94c427f4c916030d24dd3371957a1. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/USUYG1339588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd90d1f1d3b1bc77a9f59a102b700fa85e30c72a1e805ed093e4318d6cc11810f. 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/USUYG1339581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2902719808e55bb437213d55182e847b6cacab9179f46a46a2c1ef4422c290b. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/USUYG1339587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ef18fe3079b44f1ca9666c8eb8d9d1ccd1492802d34e35536150563641e4ac4. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USXQS1719287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04ac4efeeb8ecc959d038da3e044ad28e1af8ae167eaa720b0a41aefb831bae9. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/TCADB1732604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0349616c3101dec4ac99d4030481f0477ff0d2389c61cd793de323c52d02b36. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USXQS1410779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x203d96f66a4fb56d6c4b726e6063e0ecb35fa1b9221f9a71b37a152acbbb2f4e. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USXQS1410783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ed2374350c56c4074e8b1dbf9debb1afac3a9b3bce9a5a5944e90a04d3c83b7. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QM4DW1764102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85e49008cf8ef25e066111f330d46f60052fb71f45613d29f34ef1000ba64d7d. 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/QZBRF1807056.