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 0x5cdf4df12960e54aef45583eea36eb43f061089a86ad8510c8edce120edba63c. 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/1a2cb0a2-5312-4025-a4e9-00c75ca70958.json and https://artists.proofprofile.net/proofs/artist/1a2cb0a2-5312-4025-a4e9-00c75ca70958.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 0xb5c77abdc2aa26e1ee3cf9176feb07b2941311a6476bb9af7fe28c78806dff97. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZ2J21510798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x877e36b0ed0fe2cf88ef94ae80e24c3b25e25c7a021495ff3815ed870929f520. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZ2J21510799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x947f0baa5ad7499c55891e3a7314c02a0e75f559019cee580afd387796625657. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZ2J21510800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a469e694eb68846cf2ff3cf508ee644d3ae20452e5d7661eef67bcf33d08848. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZ2J21510801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72f9848f8446bd9ec5e00f4975bf358137f2372a8004d65f698c685e86970bf6. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZ2J21510802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec671ba8fd53e3e87208003b765b499c289e507999923cf63acb6eac9c0603ac. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZ2J21510803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x438c3df9145b63ca57ec5d3742a4a7038d80968ecd03e9aff06c50c9d6e1e4f1. 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/QZARB1897850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e4fb8182892cb622a4eb4193d4bd3e9a83576f3263c20027c5de21f9a8a3ded. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZARB1897851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66a4a864d760f7eb3be526055930f48e373230c8790905012bd646ee773742ac. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZARB1897852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x154f31c8a655ee7da651cd6346d7d1d3093b8756d6ebcd1381ad7d0df89bba65. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZARB1897853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3985a80aa2dd96e3e6317cee88e2676a1583cfcd4e2b2ebcde9a069ee86d8bc. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZARB1897854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab9a0f223ca2cd0c8d47e820dddf0be643a8d204db2ca306810fc4f9f69299bd. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZARB1897855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02e6da46566cd56291c460d956894880f9a9a5aa919121a72875100584feae37. 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/QZARB1897856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3db3585a3a90b210ba4ba5cffe681cbbe6fc96bdc24d5816c70fd1ce9650fbf. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZARB1897857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb4f5735d88a8276c138e2a9cd9e3f7f98b83a9b59372ecfdd9f9ae370742538. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZARB1897858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f65943a66b96a0422f634ec06cc02fe2db939e93f9e1518ede5ad58bc757597. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZARB1897859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76433a3c53afe8f1ff34afbb84eb0e52773f420a69cc084af5909c20d0233e29. 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/QZ2J21513541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9c9284b156299ff40809cbf99437393acf36fa7a3550a5470024adf978e6070. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZ2J21512791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b359f300333d2b45c834e4361241110b81da1c164c53b6ef2c3705fe27f290e. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZ2J21512789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc516c0e9a15d9061847214bb8d4d6f2c27252d299252db2556c46a3e14cecc84. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCAEJ1991813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4be557fed02743c8d3e185f3d39ad0bff0cef7b00c001e34b7b22b954686d8f5. 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/TCAEJ1991858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d3645217ea28b1132c8ede7e16d1c8ec0f856e834ce8ce3f4dd5424575b945a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TCAEJ1991984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c66dd5319fa7173ac51be953a57d53448c64424e7abd147146ac36c7eb4b0cb. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TCAEJ1991997.