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 0x2e13579643d277a2ca26e4db89b7f1cea07ba597ac00a5465a13d824627428b9. 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/00429d90-4340-472f-88b5-1145d567d0b1.json and https://artists.proofprofile.net/proofs/artist/00429d90-4340-472f-88b5-1145d567d0b1.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 0x0f4b2df65a8fb77486b63112c9763d8fd4d8f1faab8d23aa43e14fb175ceb7f8. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/TCACX1748515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0de931265184525b40aac5cca0614e23168263157acd4a427d4da507d97a39cd. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCADA1714539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2407b6a5cd1547ad66d6e4d64b30ef18147dd52eca5e29047f828257f365b00a. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/TCADA1789119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x216214f6dc1b38cbe839f91f478f9f325dfdcdaa7db5f7f721acec9e403699ac. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/TCAEC1940589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87a40783ad61eb401262c611f794cfc05645c9f58e34e289b936fd7d9c953ce7. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/TCAEI1949614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x950a4456627d86e6efd5718816e60c4d73b6a82ede266f02bce20626e7514335. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/TCAEO1946439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd28975eb28ac77f73fbb15873dd96e5c29e907384d861ad21117c375ca209e1. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/TCAEO1946485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8d32b090bd389077767d2cae79686d00a7e3b69b64306a434bdf637c5d2ce79. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAEO1946489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c2e71dd90ec58d3114336bb82350209f699138d45051bbc622b02369dcf244d. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/TCAEZ2006090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0584938f39f01176dd8a6668b73d711ad60a13464ca9315cafd451c99ea05fe. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/SKBZ32200101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc60c909df89259a53f47c5485d3bc22d7dd53a4691fbc8796b8388b3de2d9c5e. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/SKBZ32200102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cb069a9431f9fe4676d9279e0fd88e1f9a3621f1f0ba01f0c7002775b59fded. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/SKBZ32200104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe046b5e8cc97ab6bc5077cb7ed1c7135e6ca0d27f1ab4349fdfb143580e15208. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/SKBZ32200105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c85d1d6502f5e2815679e1745dec4b5ee373a30efd9be46505fb6ad19278a7a. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/SKBZ32200106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf7a41fda5e60b26161294a0438e9a4bf79731872fe8711a51f3abd5b6453717. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/SKBZ32300101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57cde29b298c40a4bba78533b4b348c7fa658bab5bf650e6582822df4ada4354. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/SKBZ32300104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a977c27d7de8d7d89a34e9547c4d98212cc0aa71a7b2717871b27e90255c21d. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/TCAJD2408686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ec622d298cb2e8d7f5499b7be577a4c6f80fd7fb1b6c74a46c5a98e3541bc05. 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/CZAC91800008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x859e2fdec8ea82632b0b0d351aa09cb45a84dbedc387aaf3ed84c51ce7596d6f. 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/SKG152200308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95e1d02353bc151ec97444965957677a43f2e598a137db5dd1dfa6fad6cf332b. 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/QZWDW2218453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9d1f6ba4a663757e5abd3aa3f1bdd0b520942fe6de9d796682abbe0371a80db. 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/QZYFZ2369550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbb3dc5eaeff12f94735046ae2957298ec0f4d5aca38b0b64483d14920e21126. 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/SKK372400201.