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 0xc20c3d2ab4854d88cc8d0cf834f2aa3de55cb6776d0701dad3fb62ed714bcb8f. 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/892f0d91-0d21-4abd-8ff1-df4b86472b0e.json and https://artists.proofprofile.net/proofs/artist/892f0d91-0d21-4abd-8ff1-df4b86472b0e.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 0x9b5857348c7622d01ff4cb176334df1bc1b1a6e57ab5eb1fb77c430b6a337edb. 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/QZTVM2382187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbae90516b2de67ca1a870da46115e832ac0fadfebcdb13b25e230ed52c6a7959. 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/QZGLS2404857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fce427b85c7242b5ac0dfbe046becd9173c6ee1054c3f1ebbb64edf5a08d4ea. 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/QZHZ52164092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0c72826eb13929c4e640c515f2097ba7402666a32d491cb554e5e1140d8d365. 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/QZNJY2126447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe558353f4e70ea7f5ce81b82ddf624eef08f146da8e2cbdbcfc8a828ec639164. 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/QZNJY2365363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fdf77c3aaafdda8a76bafe798b98d94e96fe1fdae53cc0df6bfceb9b49d1866. 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/QZW9L2283279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2d83c517353f520c876e822f1aacc2d85d894df0a08facd9e4f19a207d87431. 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/QZW9L2283281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c982559089bbe83297ed38059646a24b71d4fe361bc2af3365916e789f90ac5. 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/QZW9M2223068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85cdbc409ec706c4b198bda7f4a3ac266f9d1ce28a7c7bbd5c6adfacd58e2309. 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/QMFMF2128622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0cdfc56e175ea1cb3f75318fd2cb98264f52023290196e2ffcfb35e736e8365. 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/QMDA72148003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83c5738b2900a0548ea11df51cf5f7c438e760c39ad6db731f11f168926d2ce1. 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/QMFME2188461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe8a21e05d2837e640c6c23d4d9eff7e69fb855d32cc608032aeb99753c5f9df. 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/QZHZ62240658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0622d37667b2fc5ee1713d5f6478458388b4cc588425c894e78140224dfb42e9. 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/QZFZ41972394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e587b83ef84cb978a8c2589232386f473f4df97c6d79ab543d7d84b189a1ea7. 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/QZDFP1824737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e1b8af164753ba7d36c995a41f9851dd963574761c9fa8e90b738ff55746156. 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/QZNWZ2078361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x697f96ad0674ac605fd0f1d9a5ec2636c936975a10ee21af717eb5973a5a42c9. 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/QZNJY2548406.