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 0x46fabfff7161a9a304a3b174f2d5fd94754045fa1a0505d72ec9adf5ec1b7d68. Chain 2 (Bitcoin): anchored in block 953768 (2026-06-15T09:30:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c236a268-0150-4c74-aba4-b1d78f5ae33e.json and https://artists.proofprofile.net/proofs/artist/c236a268-0150-4c74-aba4-b1d78f5ae33e.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 0x49129989ec4a5e9d4bcdd8ca704a88acac96bc45dbdaf37fa7c98ee0f870e25a. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/US39N2310676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50deb0651b461dff22fa7f3b11a43eca41f1a5c60ea147fa23a915110645e84b. 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/US39N2310678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x490646ac38b3a9caaf04198ec99543cc76e8243e5e7a9b33ddc545d59dbd8c16. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US39N2306189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87107e7d5f73aeb3c9f033d606feb265c85a81b7fef0b305ba186c4e2923d42f. 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/US39N2310679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bc1bbb8fea50ac85462f2e2f0748d26ff2e02fcb7f6f46a94c3548aab5d28e6. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/US39N2310670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x490646ac38b3a9caaf04198ec99543cc76e8243e5e7a9b33ddc545d59dbd8c16. 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/US39N2306189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe21cb1fc4af5c6d06a5c7528c5a437808a03ae640c6b8c59e06328f044d0f6a2. 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/US39N2303098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x049239daa62449922d1d557b332cf6830a89f0a4ad28518b8ea55acccb623f3c. 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/QZNWT2231177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x155b4f8a22e4c79284550024747e4410ba3f38f69ece77c7487fec7e5614bb9b. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZK6J2284755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e0c5c7bc30123f9c30b6d7036a1da5e5f228df433833191e258a7579a70e687. 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/QZES62268929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3377147a4d359e6eed83b18dcf781e76c15046f28b9adfe2bbfebc150a271598. 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/DEPY32100096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e1a46c888ebcfe8bed54128fe88f9951baf4461c27f6c036467a28cf0109521. 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/DEPY32000315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00b2d62d26731fadce697e18e74ad0827eda24891f3a0408f7c60acef3cb56a9. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/DEPY32000278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8f2602fc1430a5df9379e7b54cc7ddf683cf6251ae4cd13783fa7813b8974f3. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/DEPY32000209.