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 0x8f16e8c18ca5b9d5b9b6a1516dee0234ec7b78b942cbb820e1db343097fa6600. 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/1b4d66d1-dd38-438d-b36f-2723a30a1956.json and https://artists.proofprofile.net/proofs/artist/1b4d66d1-dd38-438d-b36f-2723a30a1956.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 0xe2f805c3d3ff9aafc3a66c22511e2f5217d7efd1137b693b2a35f90d72dbfb15. 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/GBUM71901671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x064ca721ba8dd157ee40c25bfabba75bc195b2cc9ef3445d3d6a1dc7d94e1435. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/GBUM71901726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2db5dc2137ae1e4ea81b69b0b2b8cd1d5634da3e32a7b6b7d1b57677287fbd2. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/GBUM71901729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6054c5ffacfb241ed5384ab5ed3e05ab8023bcdf54e6b69b1bd3f8ddf7a6592d. 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/GBUM71901740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x524c55e532bd2ec7a5a9d50b9239f5d9a9d3a65d93a5b2aebea6e4b2ff14c199. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/GBUM71901748.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bd3ed37c7307a5aaf4f5b1abcd38529c1901709c7b6f2c25da3fedef780e5ba. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/GBUM72000286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e6f81b44e45ec6abd02527a88879034a0add3561865fa4c5bbf19c6aa24da2f. 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/GBV8F2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f1ca5b0a225acd0349f147e74855532e23a88413fe1a2e1098c937c338e20bd. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/GBV8F2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3753b15f5cde87c07619f11012b884211c4ae377d0e18dea32f436c88f54eee. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/GBV8F2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeae4779340412f48452f2e577c8c5d002e6fda229d4cd0ce4e75e44478a30037. 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/GBV8F2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64751e5560f1e830b1129a26ad9d31a93cbb1a799d01e15097fdfa3025ab2ef9. 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/GBV8F2100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3878a28fd81c63875e65b4165a139103545407100eb32f0952f804893ddf818e. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/GBV8F2100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5a6e4a9fb1bedb1f1db3e79bf94088350c72d462d90b297fac3aadb56c3579d. 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/GBV8F2100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86784f14e7a4759c08ebce8c6be6bbfa5edfcfbe203f4b84d42623756c9257d5. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/GBV8F2100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa58e7daf9bf5c4fe7a7cb9459bf4fcdeeb0cde4b913ffe5228f683af508297dd. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/GBV8F2100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93cf064e7ac66e4aa7870770fb9109e1f6fd845c52a5e14192e3304cddf3cb26. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBUM72000186.