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 0xb97d92c5446c52d121dc87b77ad76c2d65e4ea667fef18183bb629047dd14320. 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/37afdc64-9a15-4136-a847-3621e4725a72.json and https://artists.proofprofile.net/proofs/artist/37afdc64-9a15-4136-a847-3621e4725a72.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 0xf2fe782e6765066e22a82adbfec39529fb7c1b71e8afcd80bb2b2f395222ef07. 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/USHM80873768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc080fc671c79d9e6985427e77baadbe2f5b3b26407eaf0113844415fce4c399. 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/USHM80873769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc794a166bd56d063421267b6485c5e97e66efc56c606cba6042b3be123b4612. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USHM80873770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ca932b0a722187ce2c292d2c6586183e2b5e0dc784b3f06c1a002a828c13744. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/USHM80873773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x244b42922c51c63d370e0fad8fdc639fa32e2c63034cf8813ed4c1ed118c4302. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/USHM80873774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f95b256925cf656ff3ae54d5dea9190da6dc2eb63b1ce1a1a12d504e2cb1fb1. 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/USHM80873775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c9f779e58ffba05f06acff0c9ab48a8053c42ee1111eb17d1e23e035741f3f5. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/USHM80873776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbef667bf07a0e3418e9d5719e5521b2926ce2ac9a579d77be3afac5cd2641c0c. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/USHM80873777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76b0f03f47aec169064bcf739c540d30627ae0078511241ed2aedab0ee86c6ad. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/USHM80873778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27761f3ca86590095d94491daaab8eb3d1c042bbea9fcf57926d6f4c58446698. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/USHM80873779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf36984eda589027e04740ac7255453d5205ecefb9791a8c0c80cacf1f0d9d99. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/USHM80873780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c611c6ee2637a66c86434a1a97bd545afc053c643b5dcc7185ed0dc5b4e01d6. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/USHM80873783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbf10d267eba42d6c2751b282d1de746b5d037497d266aaedcb03c5ad5da0323. 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/USHM20866414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff8ae0362d0ed167c230b4cf8f52bd5b1656aed100aaf8074a68372cb1911245. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/USHM80878035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ca89c11155a9d643db7b0b78d70ec4aacfd755459a3c76099b4c383935c014b. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/USHM80878037.