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 0x157e632501585935e84fdc5c0e454eb99519bfa1ec788d54c4e410328540ce05. 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/93f17858-af00-4f73-9c22-7db4eb5c051e.json and https://artists.proofprofile.net/proofs/artist/93f17858-af00-4f73-9c22-7db4eb5c051e.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 0x0aef6ebeca21be1186fbf2f03b8a1d71578e62944e44c408d6309d1266cc7b77. 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/UKR6V2211861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf07c580370786d8115c9bb7513c6ca0149460b6572ad35fbb59116fff6618aae. 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/UKR6V2211862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac25441d5fbcc704f0fcc80c06c409f1ce45967d50b9c3b504c5868d8e7dbe6a. 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/UKR6V2211863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd531940b89cb059169307b43d0c822760998501955db0e44e7b7d6bac31de9c1. 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/UKR6V2211864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c47993e50fbd906e372a9ee21c91208353ce1b2953611289fd785ad5b6b530e. 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/UKR6V2211482.
When Everything Fades - Applefish Rework
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x301e3ef5109a3563c12f32846a7a6adb458078be48e980f7c8b37d215018ac7c. 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/UKR6V2211865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaa5b11d55a1122d18142c9fc28e2f9ad4d1b238e01591676f3d4b3434a9c2df. 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/UKR6V2211866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x549f97da66a49c0a817425d144288a217bfbbcc76577da0646c778da24a32385. 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/UKR6V2211483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4eaa04c3d5ea3c6dd0971b2919b172dc9baaf93a00bee8795c31878a887abd0. 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/QM24S1927054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad0c922c39586d6a136838f7a3c36a2b31b5e8e13e0ad0c7377bd7ae994e5cbc. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/AUKDT2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f4d763fccf0aba89f5d7bd00f5ab3e9ddfd2bfcf9fc19b0b062dacf3cdc4439. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/UKR6V1914428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5885a6dc85d941799c28a10c83c2e2ed70f6fd36a3f1d7372a3f369d81aa449. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/AUKDT2400102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8268febd312e5ebe1082c52584259f67ef46f23d475ed6d6c6c110c853ca9339. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/UKR6V2116981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb310921254864d3a9cf806fc1eef8ec7ee0df870b3b3a39aef4efec969798548. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/UKR6V2310499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce225921034dbac534e1533cefde20197fe3b8fb1c6d82d57a448c8d779fea27. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBPS83847310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9aaf021c7888afd125ff3bcb4e5c6155b0c69efd8bc5d2ed0ea2c22ba7263a9. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/UKR6V2212356.