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 0x5ccf9cda0201d5b0d9d4ca4ca6e0194b7f65062fb9cf19f5d087ee95247b6ea2. Chain 2 (Bitcoin): anchored in block 953616 (2026-06-14T08:58:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/19fd1c2e-0ff8-49c5-a08c-4f8c8c8d077b.json and https://artists.proofprofile.net/proofs/artist/19fd1c2e-0ff8-49c5-a08c-4f8c8c8d077b.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 0xf697b93ddbfb92432401122cef673901a14ef1bdf260b39ea86556e0781d6159. 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/QZNWR2213972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffd99f1365c5374b687750faa58506022efc1e380e93022a7368c2f392b42d7d. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/NO54D2358011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69f06e2b5d0794f3c61c1d4729d372c73e377a53ae892a0f47292a98dd8bc6ca. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZTAU2231894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38151468cf57ca4d7dec2b547fdc9d7194ba7d4be19404e4337333cfb8e72b8d. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T20:38:50Z), 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/NO54D2356011.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89701f4b9ba2023b60eca7f2ae4c00604b5eb07d60a1f18be479e359eb2b79b8. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/NO54D2372011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfec97a5cd4c808a8f2941423f41cdd0bfe286ab912fae267a407ade001e1becc. 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/NO54D2476011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4589c126692ad4613e705f289639e53c7d7bb7314ae1cda28e9efaad9cd4b7c5. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/NO1942588010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8c6e3e45da4cf5cde56f01351cf4192fa449d929eb56ab5ed796cac81975c4f. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/NO1942588030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4589c126692ad4613e705f289639e53c7d7bb7314ae1cda28e9efaad9cd4b7c5. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/NO1942588010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7dda7277f3e6a5fdf9fa3d7559ccd94840adaa0d8545df5f1372a596f94c248. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NO1942588020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8c6e3e45da4cf5cde56f01351cf4192fa449d929eb56ab5ed796cac81975c4f. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/NO1942588030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4224622d9145e8b8f2ceca8a5beb00963657bec6649a06296391c23bfe19505. 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/NO1942588040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89701f4b9ba2023b60eca7f2ae4c00604b5eb07d60a1f18be479e359eb2b79b8. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/NO54D2372011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadd0fb7d066999f56ec33c88f8790ae43ec451e34cb909971e33b48cfa5c9cee. Chain 2 (Bitcoin): anchored in block 958819 (2026-07-20T04:08:24Z), 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/NO1942588060.