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 0xd63baf8ffaffbcf741e5f3bcbfa3ae013a54a737ed31dbdd6be39e0ec62207bb. 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/49cbd5ac-d886-4cbf-89f3-a434f5395f59.json and https://artists.proofprofile.net/proofs/artist/49cbd5ac-d886-4cbf-89f3-a434f5395f59.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 0x9909ef637aa64a1b0f2c540af399a45dd4908c5b7da3db9054eea24e0ad838b4. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZFYY2224083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde1337ec5dea502784073361889b6664a8899f8728119647a846cfa0140f82a3. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZFYY2224082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eda9a5f5c607154cb9a42c024013164935b5a23cdf7f229ca04db7422798a7e. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZNWY2259370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95e0ca14b2fbf1fa93ad70baaddbe92ef0cb0da7b11f6e7190f96448ab073cb0. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QZPLS2243878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cb691fb013c5fbc4ca0ceeaab1fdd4cd195ef1c632b939c674f0420c8f283c5. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZTAS2204315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd7f4a20a3db2ed4dfefbd539bc00bb40aff1f0daf417113fe890cb8b81baf54. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZNWS2336218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x754279052eb2793b0e01fa14ca84a5e8d6984ef13d07efab89676db6fb769ecf. 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/QZHNA2486137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84aaededcafd9e71f1b7893b73e686040bf4c45795fb6eb1aa112d96701ed9e7. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZK6L2464089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3947c9b3134a6c62ad5f2c414345aaac0634894e9beb089a597816781414598. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZMEQ2408137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba298ebe0e43f2b0c651ef5f9bbf64e1d38f10e62e769dcdac531cc4b5c92c11. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QZWFG2426605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x541bc408c429f30115791a24e3b031df7d5b885a018c36050370479a64f4f612. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZFZ32597765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa347f45755ea527d4033294297a95f244f13fcea93d2535827545f722dd66d35. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZHN62574814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48e560a6783034133f49a32fe3b2b2faf4c4b80b2fe2a12fcc59c308353cfd4c. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZHN62574815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f52a64339f2c948d368c1534473b547d626e1ff7bef31d384ef655a5689dea1. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZHN62574816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56da6c9cba84636feb1f5f4ce93c6a12e7e7dec3c3509c138c55cca88c22a870. 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/QZHN62574817.
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