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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x180ab8672e11ab1ce5071aaea596c8b22937f6a434f84344a39e7e5956e76884. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/343a4976-288e-4334-af34-ed38fb38b62e.json and https://artists.proofprofile.net/proofs/artist/343a4976-288e-4334-af34-ed38fb38b62e.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25ef255fd56fb99dd20424dacf3e82f5103ecdc163310fe2199da5a226de6357. 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/NLL151201672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x762202ccea2e33ea4cc97ecfc475877f97b32672ac4a13f2f0032f722d2d8d12. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/NLL151201675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea183fa24aca7c86a6685f8036b666302bb6a8a8101dd5a0c61bef5b9acc7625. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/NLL151201678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcee0c6fd416b86a7e2f69e519f3ba45e7d457c8d2ff7abae93b580665560d8f1. Chain 2 (Bitcoin): anchored in block 958697 (2026-07-19T07:58:24Z), 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/NLL151201682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x686d71b032d1b9b50963f9fc75bcbc733ba95e099f3ee225e66d72f6f9df7e5d. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/NLL151301921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb4bad84200503e4fb7d69cea6e9b94d3d97e6ea5797d285146db1568a306621. Chain 2 (Bitcoin): anchored in block 958736 (2026-07-19T15:53:44Z), 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/NLL151301924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb279d53b28b43a5787182299c2465d8a421480c84a5f8dba55a0a2829dd728f0. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NLL151301930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29e8c25f97c9d07168ffdd22b56732207abc1bcab452058a2cf3f654784ab102. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-16T01:31:09Z), 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/NLL151301935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aa4c2dfc1923bb291ca6c05fa42c4522081f1675f3b966888ece5e93c3500a3. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T05:40:25Z), 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/NLL151001238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54a1d1e5c48dbf1ef33d9f28e56f2b738d7c561531b3eaacc4837473e229a5f0. 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/NLL151502375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cd0737c0206173181e18142c50c86a5666e6b7a2bb2be20b25e3ad9b1bfefbe. Chain 2 (Bitcoin): anchored in block 958691 (2026-07-19T07:19:31Z), 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/NLL151702754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x477aa5fe58f0735a5a40308a30000791d3d07015ecf55c56e148a67d099474ae. 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/GBKPL0924696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab791197f3a167ad298891f4cb8b37c185f61dae65bb9026315f698636cb37b6. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/GBKPL0924703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa91c2f8fc4b9bdf9aeef0d0bc9b0abdf149d188629472bd1f17cd00b51bbaea9. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/NLP8H1600047.
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