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 0x803cec1e236c06e2935959202e03ffb24ca167cb3f023d9ba2a3c3571c33c190. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d91aa8fc-4afa-414d-94d8-d9ccba5942e7.json and https://artists.proofprofile.net/proofs/artist/d91aa8fc-4afa-414d-94d8-d9ccba5942e7.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 0xb0996d74fcbf66fbb4691eb4935dd82c6e4774d73ab4fd6b53a847131da4b768. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QT3FB2525951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96f88a71e298895d739c38882c66eb02a9be4bb2ec8ecf3e038649e508f4d035. 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/QT3FB2525952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a7d6929423fa35a1e340044760a06078a1bad4499940d009cce2c1191a100c8. 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/QT3FB2525953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8b7b7e93bbf979bf05fd4c8db829d8a2396cbcc2ded9b72c84e97b32313c17c. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QT3FB2525954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7d38bd18e42f0fd219c72ec5f4de8377f94b2d5520b12c3e228b2cd065ce6fd. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QT3FB2525955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fb50c8903ffdc4abd7a9cb7914202e7df609fbd6ebb4b23d8e5616afc2e3246. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QT3FB2525956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8567caa4a06dab8961bc8e229bf21f714247dd055b52db808ca4bab8e0b1a540. 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/QT3FB2525957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe7f4a9127683cc9a1646c172d82a7685c37a82c4e33d394b90269aac8eb7bf7. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QT3FB2525958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73c1364f65ea8846955ecc01c938a85272ba4cd7e0a006c7cbffe6b4e62d5101. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QT3FB2525959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc8d631bf2e4fdc8f98a61d3597baeec2212c6b3bacf82f4f62b3b1b58f1be28. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QT3FB2525961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5c758249598c08d5f371d189b4d3cd5ac99620e37fafe0477191a8eb8c0a2b5. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QT3FB2525962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ed389138e95b60539ee5324098f383ce4eb7d5af6c3d397ca74c1d52ae65252. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QT3FB2525963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68befa80439e29970a51d7aed57ba10ac320a508de51864a76049ebb365a86d0. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QT3FB2525964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f7da530647df8e92c36d9f8d8010e316bbef49bb18d803ec558ce8c9368a297. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QT3FB2525965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b99384fff37c194e903ff0ef624344bfdfbbdbd2ed3cdf4d7717bc933165bcf. 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/QT3FB2525966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2406ca0c933861850f545844154b316299129099db38e70a0c7b283d93072da. 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/QT3FB2525967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf950516cecb7a6e0ea3a4442f90f4b8f7c87a9a78f50a06c705cdc57addb0f73. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QT3FB2525968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0218aaa99c910921d93f9c6e9865318fe0957c6a86fc64ea424148efa232715f. 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/QT3FB2525969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08296c853b41772cd79a1b6cd6c9fe0540c7ba876de40968e50eefc686eacf36. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QT3FB2525970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x214db5646db7e38a98a4e96da2f574a57c672cb3f2a5ab138e1a24e48953419a. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QT6E52531091.