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 0x59d25a06f91f8e3bcada1380b1ea0ef4f7bb9aab5aa9910c31f2d996231d514b. Chain 2 (Bitcoin): anchored in block 953684 (2026-06-14T19:51:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/66db5a6c-16fa-4f04-925b-8d5f9bc784dc.json and https://artists.proofprofile.net/proofs/artist/66db5a6c-16fa-4f04-925b-8d5f9bc784dc.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 0xe09325d4b1495d4b69e037f7116b5467ab638756ee7969b5beb0a91e3aaa049c. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/USHM80697730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aee45bc0ebc2705eebe85219bc0d5f29f798a7f2d6633580806aee0b8bd9cee. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/USHM80697731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x461e26b4c730897b26316f1d56298ebc66529e6e4d29d9cb2fcc162066c96fc6. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/USHM80697732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81d8a849196a9254ca817ed1ab87c46f5c2dbb24e60e5f7c49970636e2daa5db. 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/USHM80697733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeafca9982a4ea5a0bd0ee6582164adb7cad1a78254f61961d0cbb8ff2e1ea8e. 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/USHM80697734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82fe14798ce25a9d8ffc480282cdcf44979f81adfe1bcc05d05d1a14ab2b370a. 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/USHM80697735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6786755764e58f96a6d74cc382fc0f17020083bb103fc4ee4e6af1a7111d11de. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USHM80697736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c2bff0db16b7bdea66e9e020a966ae7bf46823c9bb191feefa67f42be21c939. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USHM80697737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c7ca1a2533a6018372addd64292196142fafeb9605b53014fbc9a01267055c1. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/USHM80697738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaf69c0a0c8668a79cfe6dcb207e06150c38a77ce565a7dc1eeea017cfea8d43. 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/USHM80697739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x467bfba4d6f996a1fdb14fdb8267212216c293074e75e6791c138500069debb8. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/USHM80697740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf731b966e373456546a2e6d084c89e2c05536dc2f31be0d51a0381509f134df. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USHM80697741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca099769e622455d8115b364214a608ecb6efd995f56df972301e346372dc7f5. 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/USHM80697742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25562692c81b7e8b263e05acf529a13e2130e75ac945e8adec650b7012be3808. 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/USHM80697743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f768cf00822272df1ec1e73fd22c684d61e18503de08e2120fc52727141c525. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USHM80697744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd167aeb01bc49792d05b29e3ce877c4c6a9fe49f3e362e59c805cd3c1956ffb0. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USHM80697745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd6defc0e329628063c105490bca3239f6d448a717d1116f6ddce4b76b6e9457. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/USHM80697746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1bc44caf1e11e4128a629ee05a47fa80b10fd70ada45bafad4f97aa7926ecc7. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/USHM80697748.