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 0xeb29291556303b2e9ae22b3050b696abc6bd5a78082958223e149c47dcd39a28. 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/a24c57a6-2e62-4f8f-80c0-06194e6fe66f.json and https://artists.proofprofile.net/proofs/artist/a24c57a6-2e62-4f8f-80c0-06194e6fe66f.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 0x02064988e471270b0bc684fd58824bde0694ad4d0676b95b15e6a2e0518f8c6c. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZHN42449464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x660c0296320f3f6c41d33b3c8badab549783c537e64ab106f0c504bff5ffb07d. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZTAZ2401178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0bb3a014b8b104111b62a906d6267320a4d769c928889023595641901ec065c. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZTAZ2401180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18a8edee6f42193de531a8d7dc2f06c3e346bbd931acd9f7ad8b59f6c10271e5. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZTAZ2401181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x820d2a0845a45551ed369d3be59359c3ba18ccb9ad224e4dc53f781dba4b9c18. 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/QZTAZ2401182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x633c3a8ea6285d0accc702f9dc6d1399d5fe404c6d7edfff25bb1b8526fafe43. 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/QZTAZ2401183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeec20fb7ce6c16731120ddc08c4c293eefb8090ab45008e046ad1af456ea1d4e. 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/QZTAZ2401184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6653c67946b2daa3b93d6c867689da0e390cfcf223f3052be69078a07b09fa76. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZTAZ2401185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd09927062090cf24804c8d0ddf9267941ecde630b1ce6b0f06c125efc8935359. 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/QZTAZ2401186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ce98720a6d7fc510e2b522385f1257362c93e4dcc59c71a6e23b9c3cd9e5b8c. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTAZ2401187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9b05ce361b0db1ec219fc776a3468ce7ad9e970970173990820184a4ed18eca. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZTAZ2401188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x966969224fbac1039bafa4eb1e814b1f82d8fb6696777df92958848b0104db97. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/QZTAZ2401189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4f891aeb4cbedafc79ac1906125f0233307240b6bf3939cf6552fe01df499b6. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/QZTAZ2401190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0647230c1de45b5c23b0317a4afbb61fa8b124e6031993798e3236a6cbadbbd6. Chain 2 (Bitcoin): anchored in block 958945 (2026-07-21T00:35:28Z), 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/QZK6M2548534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae8dbd4779ae00d4ddcf561abd542c6863f0d260bc6bf278368fb5fc3c617498. 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/QZK6M2548538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6a9962395e3cabf4c7a877479d49f592255515ac6bbc84a7b197c6b9e2d27cb. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZK6M2548539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f1ef3279125b31c174e373a77dc14072a161a574056f381d692d62d5802a592. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZK6M2548540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab7abf8ca74a23946b9206f5c9d084db1a097a2d677b761fc5941c8755b8808a. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZK6M2548543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ee017065f70d91dd80cb4059071575e0a3716d4f5d05384e8c926ea0e00bd85. 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/QZK6M2548545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3cf6c0494a0f9bc863a5f96b64508c652f6ef960e70783f568aef5ad4f843c8. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/QZZ792591090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf1455820f6f874088b79ba036bd16066d74c1ef6c8587e84857ee21cbc745f9. 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/QZZ782567453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9dc517d74ef00853548f9c0e94b3e451fb746e28616645815b6b56d125751a2. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZZ7P2507216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x360e5ecf1621513104c3c572555e487bba3d65d1f75ada92247127b390267b62. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZZ7P2507217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87426012d1a79b0ce0579371636f5267cc95f1a374d3dc86f25e42bdca285e03. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/QZZ7P2507218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33fd90bca0a01ca83a6dd775994eaf467470a5a1dfc4b5380067cc85199c5aeb. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZZ7P2507219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x829ffc2c9716c626d0c65cd5bdc8ca6ebf68f335a92428a4f4b211f9a6064e05. 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/QZZ7P2507220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6ff3064c44b84e9ec22417362b458d407455de22013296923e70e8ec5850dfd. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QT3EX2523558.