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 0x35930ca03bcb4f44ae56607caa56d4c7c5410efff1fa3a40bf94e94852fbac58. 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/73fd9aae-490a-417e-b601-978b88d852e6.json and https://artists.proofprofile.net/proofs/artist/73fd9aae-490a-417e-b601-978b88d852e6.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 0x06356d8f73f83a8dcc9c6d2263dcd88835e26304252f9eb83260baf962a2f5b8. 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/QZNMW2444860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b38b4b7ada5df7f43136d19b81cd67022c1c5041fca546a6bda39abda2ef759. 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/QZNMW2444861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6325b8f2a7439571b1da00da98bf3075c5de6d2879d88d8d9b31430236f42831. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/QZNMX2413174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0fa6875da25e8536f009e41f1230cd84d6fe611784cfaf206d3dd990b32ee96. Chain 2 (Bitcoin): anchored in block 957876 (2026-07-13T16:00:32Z), 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/QZNMX2428970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x622d79babf1015b5289701a8c00bdf03b57dd52ae5c06c93ce96b602c0cdbac6. 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/QZNMX2428971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6627172e74839168904ca8b74c9694438cec5bd131431025c4c4463bcc36122. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QZNMX2428972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bcdecace6b330af31560e699679b8f7ab518defa6502f2cb3e8e0a465d1575d. 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/QZNMX2428973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfe257dc374b47e7ff19e58b9543926c51141942e6210db5f93929fda04e113c. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZNMX2428974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda2ad87fec2f1790ab1adfd98fbdea6f8032cacfd6f14c11c1d0ceb61f3b3546. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZNMX2428975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x499430412b3328c96db8ba296676b9de78ee073bc0d0e5b59f182b4fbaf99373. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZNMX2428976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b71175ec76ae8632c65dbd4c027bdca3e1a46635ee2a2c2fd714fe528b8b19b. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZNMX2428978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa04adc50f27a144ef1172abfd229785c1c700f5e17d77b4683e5663acabc7781. 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/QZNMX2428979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a9e3c6939d7bda72d4bc6d9c59ed6c68ab11202214be6c054b3896d3383ab2c. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZNMX2428980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74ea1c884a005b9b6f2d843569f5583dff4b2fac255802d7d30fd9b49d71c352. 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/QZNMX2428981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d3606b24f3fa8688f72da126337675d5220a112b6151a60e53b58ee0717ec26. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZNMX2428982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b8d0682fa253c47838fb1ae18636135abce50774ce787754611232b72058faf. 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/QZNMY2431821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fc4981a8437cac9f1edc9af9e328f070c0f2097fc0a59c0c21c87ae27c4d9db. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZJG52540757.