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 0xd44f52caae4c39abac6ee006adabee8b3d1144d07e15be93092408dc1b15062d. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/799d96e9-30b9-47ab-bfca-9e4f46b34453.json and https://artists.proofprofile.net/proofs/artist/799d96e9-30b9-47ab-bfca-9e4f46b34453.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 0xffad6bf6e94a68a857176f41c296c641ad897ac9a967d7d8d33f65b5cc48b090. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/QZG2X2419901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x620a10e6f32f264fe2434baa05ba562de088257e1f47229495439487446b5886. 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/QZG2X2419902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x530b876663b30f241d072c8c2d51c7647aec83d08faa985b7e667b95a4a7d169. 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/GBKQU2538114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35924be10d26a47291ce25cf9f5f4a2261cb9453177a6529dd7950ad14cfc55b. 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/CA5KR2531909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa77ce382f6218cb491d55f023139360977cc8fbfc9b706d1c85202e7f00c087c. 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/UKR6V2510319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5b61ca5eef0d152e3c9588c961c24139087b8761fa1c062dee5963a0143789d. 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/IT8VL2500083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00e33c8e1c1c7ca1476a4f10d0c7f99fed82f7ffae9aad385e7993312d679b5d. 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/GBKQU2517170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2b4eae87e4fb659d55db4232576d7270a9c68e94ba3292223ecf6b5ac3976e9. 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/QZG2X2414559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0f7dd9d50973eca6e5c1eea7b053afbd362bb3bc5c2cb4331507e4746305fc7. 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/GBKQU2518135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x304997dfbc19e1f45003a1e6842e3eaf96b6af9b7e5506f4c7b32e14b27f797b. 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/ITSV22500025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2fe6849569e676ec5ef1c4bc36494251ab3021ca62435ec2b739e09d97c55af. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/ITSV22500026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd8c6664a9b11765b2333e347d1b55c41df57e4777f4d430485fffd89c45179d. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/UKR6V2510042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ca42935eb5e53ce4e16b967c1634294b7fce02864186764b5cd8fbea91e6da3. 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/QM4TX2505370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12fd716a76b9d8c9412a4157e09ab361e2e941ed4a68b763b3e40aff9b5b6b11. 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/CA5KR2502710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda4b24e795588b91a0bf63782b9e01c7688b0e4c0d5ab817ee56d5e3b70bc762. 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/GBJAJ2401690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad8e8f7cc014872e02f40d7187ddd5f611023a5bf5b521f3a563365cd84db499. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/GBJAJ2401689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60d1cb5de8ff4472f7d3349b4f7036a68510d23ccb24d44110ade6a059e7ff6a. 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/GBKQU2498982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9782388c7e810d62acd5c7411ac12313c7df3a0f030cb54f37b5757b35979dd3. 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/CA5KR2495371.