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 0x1799eb9be7bbbe9c36d9649ddeec2fe19ca90a9bd479fad95c54901eac2fb61d. 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/fb3fc532-8494-4aff-89a7-16990a82a467.json and https://artists.proofprofile.net/proofs/artist/fb3fc532-8494-4aff-89a7-16990a82a467.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 0x1ea9259eeca4bb905bd62983844b4272c715713fc4c2a10e816b27bb5c87864f. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-17T00:32:02Z), 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/TR0441721901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32834c3829f77bd2f8a7ac9880dac917dedfd42862c55697f897c0e5f2e2cd84. Chain 2 (Bitcoin): anchored in block 958908 (2026-07-20T18:27:39Z), 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/TR0441721903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e45e4af928b37c0ed7cfc90c333be6945ab6e4197e3ec6e71985032752023ed. 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/TR0441823001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4c4cd98815b0af7e29fbd29a032a3f41ae0df8bcf65e453605b43ad9b688a9c. 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/TR0441823002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0b44705e26a24e1e924ccf20e20322b035b2cbfa4a9d681a2774aa5e8f545c0. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/TR0441823003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe30b037f6a9f876b9c4b6a82024d5ea019b998a7d88645285ad3beb8d82dfadc. 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/TRBDY1917601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e72c19132fa16d0904ad7a35702fcadea2008329d7e6b17126f607f53026fa8. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T05:03:42Z), 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/TRBIY2000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1360ae8c0943e064934d362f82e65ae586374989f67d8b5168d0334f73649028. 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/TRBIY2000036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a24cc154aabfa61b79a3f91cdebf40dbcc29d00622b4db9efc855a04f0b15aa. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T23:13:30Z), 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/TRBIY2000083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0277160e5b37398eccde7f0b1205b6872512dc3ee314b9c0e7bf80dd1c10da1. 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/TRBIY2100030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96a9fb0b300f8ab0a94c77d258e001e472e1302b5a9683b4dedd0d8ac9459c51. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FRX872131676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41eba551e44edc3178efc7b608643408f17602452f19bd413d04b66fe35b0b67. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/DGA092210444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x479719c863e4a35e432bd2ea0e0c7058965c16c5362a1109f379b4ffd0150c08. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/DGA072348125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6069745ee685e75ab44181defe5637109290a48c19a113b1fa21a497492e9f69. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/FRX872586810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8c305fd5aa842d4d0f4841dcbb3259803bb66358fe93eb05551e2a5b2395296. 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/TCAGE2279255.