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 0x9874d9ff09e44ee5411469529f9cd6497a4fe911582b5d8923b8a2cf70c3c8cc. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8e8c0e2f-ef7e-4c03-91a6-d0c0f0a03196.json and https://artists.proofprofile.net/proofs/artist/8e8c0e2f-ef7e-4c03-91a6-d0c0f0a03196.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x784c73bd8ba0f7eb06c60bb57256666385743c8be742014c58eeebb855ce023f. 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/TCAIG2413229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff4103e25cd0fc727226f7c56e5923ddd6926089a42c986218ab27dbb2c3fa60. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/TCAIG2413235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75dcd5265f8609a1e558273b3f52bd7b1e8cf22a0f35b586fe2e6b4dc9bd9709. 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/TCAIG2413255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d84196292b4473d87092fe9d67cc61c05d44c1fb88b4607929efbc3296937d6. 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/TCAIG2413260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe551329bd2acf9ead0b426022d087f4ed438655356089d1af0a0ff886bf773ae. 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/TCAIG2413266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb261df4d79cd8a341bcf37abbdf9551c322ce506dcb40930967d709e38e9b56b. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/TCAIG2413272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fcaf289725ca68b9034e81d56e9bdfae5391e6fae7567f955d8a35dbfd6abe1. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/TCAIG2413279.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08b33cd11e8e15dd12c24b147b0e2bf54416503e5aa212c6c58347d3f1d46b9b. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/TCAIG2413285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53d759b95619679827ed54fc3d785bb9ffd2393d6165ad0121f04ddd195b0ab6. 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/TCAIG2413295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x570b2e4399a7a41edf6c20d1da7f8a8b0f3af16496fe13570f5c165661912107. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/TCAIG2413299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7864e1bd673c1ebd13612bca03bdff18c6e019e59d6c2368202ac31e0c53c82e. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/TCAIG2413305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25a162ea2223edecc3ac3497347d32a9c6f7c4138b644047a21c43ca793cc465. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/TCAIG2413311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85d888d0e0e5bcc8457e102b1b3bad40bfbf5aacc5f5b70258f10c8607d14ac0. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/TCAIH2413318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x523c07f767bc4deeb28b07bbc007de823ae14187929177269d3682398a40255a. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/TCAIG2413324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed37ca7023615141d3b34d04cc2953d85b6ed199bea4fdafd1456a6c17f2a50b. 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/TCAIG2413331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30881663a512238267dfe1ca9f91f29b1c7256f89329065441cf9cf8dd7c83c6. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/TCAIH2413341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb786c4d466e74437bd9a107c7b5176170e57a34b8727cd39bdabc7415b050c1. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCAIG2413344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x054d4478724c41e37b91306a3ca328ebbee74f09bbe52267aadfe497d33347b1. 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/TCAIG2413351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ff2e4fa565e6135ff0057cbbbbc5b5c4b335e32f38976e08533dc233a647978. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/TCAIG2413356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x408ecd6d66f8ec0a7e2be4f36187267b833d86b46bb0f532d63705b7f78d272d. 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/TCAIG2413360.