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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 0x5109ba5df0974eaeb556b4963779aafe0239ba8953a843772f8493d438e9a5e9. 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/63575197-def0-446a-8845-ee3d41ba5c51.json and https://artists.proofprofile.net/proofs/artist/63575197-def0-446a-8845-ee3d41ba5c51.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 0xbdf3903b106f551a4f824cdc688696b20771f7d9ce1f2d4f944d6fcb3ac85c11. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-17T00:35:57Z), 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/CAZ700902177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c51abfb73fe2b41610eeee62a5bbb1c760019a760bbc5e94606184ad0c55e7e. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T12:47:58Z), 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/CAZ700902178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fd6e673754d83eb9b635760029235d4ae2b07fb5d543c0789889b4164f290d7. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/CAZ700902181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb73d2f6f5f314af039b6821f5cad0e27f04856595cfe392acd26992a03db1ab2. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CAZ700902187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52690543b0acfeddac5906fff27b61923f126f7860682109333425dd1a2c5b3f. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/CAZ700908289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7381792fa2024ff32e05b4c85b8f505732c7062b12ac6b2b1a5b7e27a2e2298. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/CAZ700908293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e314df5482222c9d5caa52f6b254e8d828ba636de67b46e301ff05a52c15c51. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T17:58:04Z), 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/CAZ700908296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1536aa134719bd336cf48907b3b9f3a121e770846ac0f497ecba92268d7856c3. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T03:41:17Z), 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/CAZ700400979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4aa075a3b347b795cae4f430ee214618b3621ac3b1d5ed701947a5ee2af0d45. 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/CAZ700907819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9abee0f1828b86c8d3340418b48422e043b1a5d119f17cb8f5cd58c4a26791c3. 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/CAZ700907830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66498e801a71a54fb69f1c21a3c201fc3840e2b03cc71053d79e3aa82d9c4bc1. 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/CAZ700907834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x545ea8846d32381fd3038d2b2556aa64ee87815d7d595f1df1ea2f7cdb7e9946. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/CAA0Q2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8a697fb20ee361cd705e3b91e34b64eee958a136b06cdc9915452ed8be58c4b. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/CAA0Q2000011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02e8b1738e9aeac2ff98551a9c39d1021646c501f6dda55825043df26c21f9b8. 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/CAQSY2100162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23d206390b160ffe78050b3c9579fb782b81c794ac95c420a29d79e03e4cdb49. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T19:43:45Z), 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/CAQSY2100168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5bb760a19127dd1625a38193d658ce5ecd5fad12a13f0d10411c2dc9a679ed3. 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/CAQSY2100169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b51545698341c8cf4b11a8e60ebbfb9d93100bd1a2f7a4296c53522df8d4501. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/CAQSY2100170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f6fd618fdd3c22b5908d8aabe4ef9ab69fdff1c36af244597c77d0b971debc2. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/CAA0Q1940012.