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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 0x2bbe40c92e73e1d31ce2343ba23098535efe4ecd9ce82446bec710ddd232a1e5. 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/86263acb-7033-4dcc-88e5-3efe0603cbf9.json and https://artists.proofprofile.net/proofs/artist/86263acb-7033-4dcc-88e5-3efe0603cbf9.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 0x17f76d1109f62a7ee2f7907d8a3ec22305ce2d4793100b4e1e52f0ab9daacd0a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES71G2334538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21936fdf4fe8869ceaddbcc00e7e026b6ec86de98f44a36f089bfa48cdd598db. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES71G2334536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9400d92ce82f73c0bd7e1c1896c1a1858f2f03be22f34a1987e16a393422259. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES71G2334542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0bb0a195146777924782fbb2f8f1f48b8e43d24dede4d0cdf590e114b845534. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES71G2334544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a6ab95ae92e86d3fe3450b506f71f21ec6880374dee1db7b0a128ce76adab7f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES71G2334540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3e7782d012d3b938f2ae2558c026d44bfe40db69f9986ac83c552eac178cf5b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES71G2334537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7707fe47dc455130bd593c20ada80d01d3197eb29c0e626d8efd97c5b8bb98d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES71G2334543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44e1c8e3b7105cc07faa246dd15d6a822ad7d5206e0fc08588a96e296877afa0. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES71G2334545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cbd7314524462efe86b1ae974ec6b7bd39c0947f99a4a4dfd78952b2f3a2844. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES71G2334541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6548ea013387384821b7d02c1e3c97579dbb7179ad187267aa2cce395034b0a6. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES71G2334532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6548ea013387384821b7d02c1e3c97579dbb7179ad187267aa2cce395034b0a6. 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/ES71G2334532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e0b2add7cb32e43a1b900a9f9f5800774985fbb20baab28100ec3d56bfecf3b. 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/QZES82209837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa3ca2abae6e1df38dff0ca8a5e001404ce1e28547d45f6075b4c8f3c39866ba. 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/QZES72193638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59a980a54df8f856e5caab3fb93759fb5d1948de32135c3de3ab593607dccb5f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZDA82172960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7a81be733b82fa57bd0e7d171101a76368d5479e6a11d667d3900e918a36244. 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/QZFZ72184463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac65bc95eca8c70f670be91d1a313d3f7c71b6e5982dbeec15d70e2aea488f77. 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/QZNWW2022824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe106bf7990e8f7699405f06903af8b6c52dcc9501faeceab265f158505c76663. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBSMU7746757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7a81be733b82fa57bd0e7d171101a76368d5479e6a11d667d3900e918a36244. 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/QZFZ72184463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf4e5aa2e0d5dba665628d56422edaba194529927bce1184c3ffa5bd5b510c1d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES5022300967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ec3fafdf491e66f0e0878ad127aa45f9bf2fbb90fbcc0e38a33b0d7e36a2717. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES71G2110718.