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 0x8f737d20fbb158a6d59335906896776fedfb43dce3152ecf345623f121987bd2. 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/5f0275b2-be00-4df8-bb7e-ceae9c823e86.json and https://artists.proofprofile.net/proofs/artist/5f0275b2-be00-4df8-bb7e-ceae9c823e86.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 0x541310921ad772babe4e43ae90740c654b29a47361ff62dd6b85dcb1751bbaee. 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/SE5W32406055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1727a656ec47d0c139b5ac4acfa312cbd854b5263fd5960c4128f754ed4df74c. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/SE5W32405987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x735b073ce8b56bf6c0e1b039a793e1879b7d85e383e4451ea54ff956e5b81b0f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SE5W32309879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa875c692660398a2961948087ecdf368eb68934df6f66d08d72e29ae15fe921b. 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/SE5W32308978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07fab2a07917edc56773af282bbfe3c41fbc28247e7f2c0602abe33623f7ca25. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/SE5W32308593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a4c4f3bf9e2abc04c874fc69394ad10f82aee8835b1638179a99a20793f5741. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SE5W32307136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d7ad7b5a4fad1edccaa5daa32f1b657180c0c0f9bd4b9aaf4480dd85f432220. 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/SE5W32306499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2f60f7a130a72e3939f542bbc8d6eae48708d04dffa20e7bd4ebe19d2478965. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/SE5W32300468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b02ba2f6db9178ec52f909d3bd5978e8a1fdb81aa6a43d0364ce47f0e4ec653. 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/SE5W32294077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc487e9cf8a38e25564ae00952f381af7205a3e294d4a6ad610b6e102248659ea. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SE5W32204523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbed1bf904a797d1f1a69e5be7ebbec4e8f2093e127f60c184815164542132538. 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/SE5W32202598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd535bd820bd601ef47f945a16c9d95957d44a7f1b8b6bba0174d6200fbc948e. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/SE5W32202081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae2b8e460eaeff1196bc3145a592b089d71d3d896ad51f1d72fcf7acb5859ed1. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/SE5W32201735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1266e650a1964fda2d504f949037e88c4052f77ca52438a62453d70bf021f28e. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/SE5W32200434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50126beb3b4f794c5c663878b7bd41bce8a7677660ea88230bf48e6c346b2cdf. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/SE5W32104255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xced3598fefc70a6bbb1ae6943dbe92eb404f9dd1132061da3097ee3b10f6a8b5. 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/SE5W32103581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb09921f0c8cd04ad789a4f3c39f8f067cdb36af26f1abe3bbf8aa80af1f7dc0. 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/SE5W32103037.