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 0x6e319f697fe61400f2b28637951b7a05eab1e8ed34a5f54f47e9a386d812cb20. 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/88c1c67d-86bb-44dc-a741-b3c7a8ac5b60.json and https://artists.proofprofile.net/proofs/artist/88c1c67d-86bb-44dc-a741-b3c7a8ac5b60.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 0xce5473b94a53bb7f970d02beef88bef5ad2d7003e89911ec70a78d361ba2b2a0. 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/ITDF61917001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b919e63fd07e5520efa5c7be5924930363246b5ce62aa54fc22039d9122c071. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/ITDF61917002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41d8b45873002d72b82f2e8dec9545f900bed4f9ca5604d7d7d9d63a7b8ff16d. 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/ITDF61917004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07c9436193fb246c5720549e8183c4e1f40f5fcb8eac06a5cc0ff000037f1040. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/ITDF61917005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43a67b75ea714c9c06989980516efaa680ac9cae6dde427c3592c3da6ed8ee85. 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/ITDF61917006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb821f2e3b3705f58fccfc971da74ede0877ecb2aef65847b87d35df48f2ae99. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/ITDF61917007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc5a26fa4932144e980b72703cbd852024db030eae756e1581470704db9700d1. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/ITDF61917008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1ab640eb914007315615353e65be3251b229e0c958eb2ff38a5046d28916104. 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/ITDF61917009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43f82afb03c9e1b8d7c2ec50457439567753276dad1e7127f7da8c14aee7db0a. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/ITDF61817047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5421edbba53ee990158157b69a3ca2645a2367e26b72754addae9f6da0496db5. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/ITDF61817032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5f981ab80b3454815ef0c7a9695f1d7cec3397c4ad56fc018aef8d2f14c4840. 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/ITDF61704005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43f82afb03c9e1b8d7c2ec50457439567753276dad1e7127f7da8c14aee7db0a. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/ITDF61817047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94f647ddf3bdf0fdb0e2b0e250fbf9cad2c0d8f303cdd1e87a553948b46c0c06. 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/ITI021400150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36282e3eaa1344b13d47d5c043a71b718cb83c96f1a7045619c4d7d96a885654. 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/ITRSE1600683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50f046ee476dfac86c64ff9175bb8c858b5c8b44b3d0c22f3fe9eb6aded3f209. 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/ITXUS2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1119b7e88cb332be0859c9841bb15da2bfee05c497821bde15821cf088f86f38. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/ITB551915747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d5aa873fca74e8376da4fd4be6c13eee02da650797ff1e8364e620860dd9149. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZHN61943092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8bc97afbd3f69c6e13dd992fea5d163cf3a9bd03237d69ed33a3001af928849. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/ITDF61805018.