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 0x0c4340890d94d827c73917a48b6b83b45a1073f26d676e1c0f434ef757c7dd28. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c87bb137-e70e-465a-bdb6-c90c8b34f7fc.json and https://artists.proofprofile.net/proofs/artist/c87bb137-e70e-465a-bdb6-c90c8b34f7fc.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 0x6a92f6a3f2fb2ad26c04ea86b731ee4ac8964e81a8f695b964077f1679217b74. 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/USA2B0412201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6e7e4367de91530e5c70b79e9cebc8af5881086c786de0b77d5bf11cb25e4d6. 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/USA2B0412204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a9cb4a9edc9b6d4bbb75e00deb92e9d8336df38568faf2647287aa4082a523e. 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/USA2B0412212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5a0af2c19b94a2b63195a02067bd12abc317ed762e6dcf1d3a97729fc5f3d24. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/TCAGQ2260949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3f9f27150c0a2610fffbab09a6d45766f847f63a92bfccf69c95cd3674c0f49. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCAGQ2260957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6784ff35f8425b24ebfa5cdb4f703d4f2c80f8e9d4bf58d77b26be4c470c148. 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/TCAGQ2260967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5d37793d4d012506c52e2541ce907419d1beb1d2fff493835e54a32247d6300. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/TCAGQ2260982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a1a05f152d15008fdc1e8badd39c8c32d032b9544507b37330d0f449e82cfc8. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCAGQ2260992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf468d13d1a9d820f2cfab2ee83c0312a470f630229c59a0de5a7b498902d7d7c. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/TCAGP2276685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86ddcaa8cb8500ca5bcdb43d5a1c5dc83abf816afcfbdc4f216be4486bf86e41. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCAGP2276693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0594d2ccb2240f8de43df46818791058ca97a9f7c0d4b54e8b527c69e5d0da40. 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/TCAGP2276737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1d9b060b15f7cf7563915fdd4cea9cea3d4723b3b0b9bde3b9821fa34123d19. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/TCAGP2276754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96ef4e323da95f184a74a3f01755d1e15665f90f904be479c6590401b20da0a8. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/TCAGP2276771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28530ca02c458804e224d570db1e795b53aefcac22177db914b8a41b914ee408. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/TCAHT2476030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8055d36ddaaf8962e11e6e6d36d312f20a41875de442efafb63935815d3e9e3. Chain 2 (Bitcoin): anchored in block 958680 (2026-07-19T06:04:14Z), 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/TCAHT2476071.