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 0xce224e28446cd04f51884d36bddf4c77555386260089f6c8a004e6652a4a8734. 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/f050dd66-bcd1-4b88-8189-a419ac5495d4.json and https://artists.proofprofile.net/proofs/artist/f050dd66-bcd1-4b88-8189-a419ac5495d4.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 0xafdad918f5700e748f47a81825d0f2cb9742b3753c0d17ddaa3be8360f4563e0. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZWFP2410648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a83e68bc2da349e92c883f078d1b5a56a1f07608836ba234e1522c57aabd911. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZWFP2410649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0258fd623da1a4f95ff4d13b3ab1de683ea6e8f7d15b38d155f1a08ba1576cf. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QZWFP2410650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11c358723b2e05497224e67b454816d5d40f4d819e98cd2c91f6a063977f57f5. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZWFP2410651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8755ac53b574261a42ae80ec1c3902fbca803333f9a1f21f7105765f35fc606. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QZWFP2410652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67d2b624e8c94291c533399992a4041cebacb63805a3aba4baa8b6b99167959a. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZWFP2410654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90542babf7233b2ef7205a2cb0bf9fb6c78934919b8c8fa3c6c595aa8a88cbb6. Chain 2 (Bitcoin): anchored in block 957756 (2026-07-12T21:36:27Z), 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/QZWFP2410655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54110f17d79d72980e9e4eee1785f71733453a1dfb9e37775e42ce6b8436bb13. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZWFP2410656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x984b8eb17fbf8e14cd75c991abbfed74fded89285127aa7225ffddc0be027b62. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZWFP2410658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2dd282ec24506e30296abc01db6e2d819dc7a0f273910c0b9fe7ec67ca14045. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZZ7M2452848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb104b2f49ed561dd70401e87d8d42ddfecb63344e487dd61643f47fec0bc810. 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/QZZ7M2452850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb73ced0d8012c12c0c9beb0989be56edf4b9554e7b14ad2d7b4cf560dd11b1bc. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZZ7M2452851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30b473a8143b97be71f705e4da2b7b900d46101773b7ea79d7b7db5452a97f48. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZZ7M2452852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c0d95277df793c14d7abae57601e4dbd5f23cf8c539a6093e8d779c441c8d87. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZZ7M2452853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1a7d1a03fb2d70de015cb15a603ed36f9508a652fcfdc1d869ef8b775a8698d. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZZ7M2452854.