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 0xd37c59ac4c498bec246f22d7c9cb858eef1d076981db7caa1b39940dd34d5696. Chain 2 (Bitcoin): anchored in block 953947 (2026-06-16T13:14:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/222e2092-2317-4d43-8707-dbb36136eb2e.json and https://artists.proofprofile.net/proofs/artist/222e2092-2317-4d43-8707-dbb36136eb2e.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 0x2aeebeecad9fee1bac4219e7b3b509038a313ab3bb818c3e7340559d61a54812. 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/JPI291517201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89cd5f73cc6161902963eae27c3aaac0e49befb6ed80ff273498040d749f3e18. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/JPI291517202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc9da8d933141e081275989d811ebfeb6e8608d1b0a5ce79258b4264b4fe199b. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/JPI291517203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe01a29de0a8219a615ba8e7ac53bb6b511a244e2aaf4823ea415a7be0799f03b. 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/JPI291517206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f05cb19114b10836102761f70438dd3f611de0897ae0d7a7f766a3c91225e1b. 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/JPI291517207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc66bb408796a4b1808e7632c9c31c946a3f5a5c91a88b2e334b1d5bac80f83d5. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/JPI291517208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cedb8865e0d8dc7a56f57b9460ad2d1348ddee850493822ddc4aee4e2114b37. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/JPI291517209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x840309a5586800b6fe699b68740eade84783baed71c45cd3038ca856d475dacd. 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/JPI291517210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf84cb5b4d72366d92748dc31c5e5c97a0c9cc87699aedb2929cb9c979a7f8e3. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/JPI291517211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05ae43d8570ba72eb5fed1ec6ff9b7ba47daafc24ebbda7c43f376571e8bc31b. 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/JPI291517212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb387353be41e1d6d68ba65a0b8fc0dc605f783fbf0c3af12feb76390977ff76. 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/JPI291517213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3458c9f6e991b6efb91da8ba8668cf1f95121188d243ebe7c312a59633d234ef. 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/JPI291517214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3d1e6bbf7e9b93e6474be9505a864c3061ad4de06fa30ccaf71b96716569d7e. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/JPI291517215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x389e94726012a43b654e82369a6552896690a0475d2a4bc6ab14ca0c0facc5a5. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/JPI291517216.