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 0xc68a33a62b19fb0d05d48b15f8be167e3139db08b1220d891aee242030ec6e44. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/57746b95-edb6-4f56-9ace-157b016ef186.json and https://artists.proofprofile.net/proofs/artist/57746b95-edb6-4f56-9ace-157b016ef186.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 0xce7ddb699cb6dbf754d2db7a6ef908d6f6f000b8020e64e77f53ab7b491a4c97. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZNWS2577678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda2a62a67bc644422834e2c67f04c391c93ba63d8a90acfcf338536b2b09f3d6. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZZ7V2505700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00708e46367b177381c1db9bdef155b35012ba8e484635e4e657501fe9ca6d41. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZZ7V2505701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46b241b312ad28ceddcb603518b9f13da4faa62d10ca65a6a2be716b8fffab08. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZZ7V2505702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x062eeb44093c2aa7e01d5b4cfe8874d3f7d2cc4cca4574d487abcbc0ac46b80f. 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/QZZ7V2505703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03c7e22a789615cb303e8047dcc27746aa61abe900075e22b195c3b86ace4967. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZZ7V2505704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4db1cac095ed1b0b69883ce591a4aed71eaada9a8af2a58764b375071b7e55d. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/QZZ7V2505705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf01eddec000222beb6ee823b9b525884a0be2d50898776f5822e597bc17b4551. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/QT3F92536535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c37672f99abe66d0eeea4bf3c434b8fc5e7fb4585ee4e2e9977266fc0d3bf7e. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QT3F92536536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d81651cc41ea1d46e077fd111c4af67493d6dec72e638a13b8ee74e9ca1ed71. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QT3F92536537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4bcc4f1ab4aa2e7ce646eea5869b9b034e76f7ecaac27bbd510f1770f161361. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QT3F92536538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13aba7a5be9d718ed1cd30bfd76671a14518fb98d8b8883c2323387670da0cf7. 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/QT3F92536539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9da882d83994428678131954bc710f837e0ea82e4d38dae888bd15ed52188fa4. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QT3F92536540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf352de0f6ec990d940dc26a75523eb595afdb99912664be4795880bb11fb27ed. 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/QT3F82517570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d48db7806004b8a3ec90a4c4a260c5166debb163a020430612b2e1ee0296bfa. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/QT3FH2539063.