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 0x47f2267b9ad74af3682b2b247c3a1365f78281f5d4a24ac949214e269e61c04e. Chain 2 (Bitcoin): anchored in block 953867 (2026-06-16T01:09:47Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/05e2ec7c-e491-4d8f-9aa3-cf2527da834e.json and https://artists.proofprofile.net/proofs/artist/05e2ec7c-e491-4d8f-9aa3-cf2527da834e.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 0xc1365754110d03cc10da0f0a3edc03a1acd12b46b5fd8dbd2149b776abe4b8e7. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZES82236170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9b501eba4a4e74520d042de89ccdfeb2f5c5588306dae562b4d1741bc6a4cea. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZES82236173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17435e8d342181727e181052eff11b79365f0530bc40ba7b1d926f0df96162bb. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/QZNWZ2092270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51241576c69d015622326cbe4dafd5f15674788f7822b0fe332cec41b51ca801. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/IL7192500111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b974d4a03ef530ed61f6c505f507f841eea3e84cf3f66b559f3649192c041f7. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/IL7192402865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c210b6bcb35f640224a2759632b66fac72682fa98d2ba929136a5fa9f1f4fcd. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/IL7112001375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd807a2962aee2b4912b584878622659c7d6d8ff3329ed6b0b7e456126863d9bc. 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/IL7192402336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3dc82cfa31204ffecda9a51cbd68bb622fcb911a2a05dcfebdade5dcdddc729. 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/IL7192402337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90e0ef2a3c62e076e4225e1ed18001a0001b507108da9e3b0b566d9fd8760447. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/IL7192402338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde3b757bb341d61caf7d6c78d85c742556f9daa15be00c08389f90b5036065e5. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/IL7192402342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2b45f5a0cecc87dc41c0a408b35dc7bec4b42ae2b219101e6da30bcd336e3fc. 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/IL7192500042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe30b28b45aeb334e91e2d7cccf0a63ce4d4960ad9136bc0f255d4f988ea59d8f. 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/QZDA82139626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f5cdce072dae4341af252f13bf0e71491e730d8c88e5e5b62209d1f3007e834. 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/IL7192300118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc978120970b94b1f3ffdc34da47356a97d765e6e006c4d3710ae7a055fcc97e. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/IL7192300119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f75170502939e1ebea599bd992c24e280201664529fcddb52ced1f16caf39ef. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/IL7192300122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf7a04936e07ad1f6ddd220b9f6e934a2ba276bf006d1e671437fc4cdfb36d73. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/IL7192402243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dbe107edc378f8b62a5337f7128d93ccc70c204a3000baf3bb6173144fcd717. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/IL7192402246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf0508e842f8b5c516f3957a2fce60a7e5775824d8605baed9de865f7f4b046c. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/IL7192401527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f02c0b42efd47bcfc766480c01f6cb5ef1d95dccff33937eb0f9a5a923be5f5. 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/IL7192402247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11b9cdb4dd81d62db2326a9d9dff122fba3012a74af9c721e714528bdc41938a. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/IL7192402250.