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 0x4bacc28469492278d6c7390d66d62077b665c10e5f161fa2e9f7526022d7d321. 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/0df8e1a7-0aa0-4950-96ec-f7b409a611a7.json and https://artists.proofprofile.net/proofs/artist/0df8e1a7-0aa0-4950-96ec-f7b409a611a7.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 0xbaf1535382bde489e6968fd034fa71412d07d7c20ac0e38e82d395bf100c1bb8. 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/USCGJ2187525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a7e6ff7f76c7606b7889f39167413b42048120aa4996fd984bc9604a1f32b35. 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/USCGJ2187532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2b2e125107a1efe39cfa3551621f9ecb4b99d07fc80a0eed0a0297a42426972. 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/USCGJ2187533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcced6974d703b4ad02cb9c92f7f8b0ddda5d82bd5254f6825e62921a311d69d6. 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/USCGJ2187536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x591b7a22388fdd0feb2acdd9cb084192457e669f0c4454a46a2711fc6fe0237b. 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/USCGJ2187537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1117ffaaeb631171a32647c98fe187f3f4a43d6289b5b8448b08a0b7af9de21d. 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/USCGJ2187538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddeecd52e049d1a861d49ebb519e75b98f59ad3d668d6b09700c4bdb20f88562. 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/QZMFV2000212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5652eda56553e0421ff789c371ada842e1f8dca22a5c1dc8c32d2e83b9eafe2. 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/MXUM72400625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea12ac858abb4c8380e0c9037c306d07580da10871588889774b699236fa5f9c. 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/MXUM72402369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73230a4d0f7cf1f71389624a59b1c322ef78f5d3edb768a195a352e33229e2aa. 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/MXUM72401514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9697dcae811b8c35afee7fdc1772f8ade6323516fdcba7e3b1bdc16a190be257. 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/MXUM72500367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ecee9ae57a90a96b069fbff66d702f70021c9199747bedc7dba3bc3f9d890c8. 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/MXUM72500636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52aba47031b902bba52ee775c55552151fd6d69159424e3b343e32e077e0e2ee. 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/MXUM72500640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x438e9bb9cfb85f5293b88b8aa5522774689914841856095ea0ae355206781267. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/MXUM72500644.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x433e76bb45f2cf987f004aa5656e268b5b8f13356c747fd4086fc9917978703e. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/UKXN22236258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7dcfeb35f68a508a3decff4b245b9b4e50034b77b0980c90595934a85598e75. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T10:08:57Z), 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/UKXN22236260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x438f276bbc5c281028af1226382e1a7851a9d75c0254ecba3feffacfea985e69. 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/UKXN22236262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaa6484ae0193c4cf6556693a0b02ee0f0fefb9f6e6a9cd92b78d4615855ea7c. 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/UKXN22236267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc99ad8287fbd1d011ea4111bf2ed1cbdec25a67f816d6af2c9109cb0d1fd9e0. 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/UKXN22236268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x530d63cfad45a76f8f5d56a652b3d98395275de12daedbde0550dc87f13c781d. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T08:38:14Z), 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/USCGH2211138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd43f6b643d5a94311742763b641e1ccd499e1283e897754de418e9d271d9600f. 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/USCGH2211146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dd9041149e451ac7e8af3f8743279ad99c36807b586119cb55c6d880f6b2963. 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/QZDQH2501182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa391bf0a64143de246db11313855101ba4b47499da629d91da59750dfef831ad. 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/USA2P2319743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x639f878f67945a458a3d6b7c105472af0359d4a0879987f898d86b12a669e862. 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/QZNJW2487687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9696a7af6dcf8292f7d01c1100ec0c71c5517019e0d7834d4984fda0ce5c87a. 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/QZNJY2468100.