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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 0xbf198bfff0cd8b8b687ad618e43137bb367a281a24481d5b7d488d36eea5bc19. 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/277ab7c8-3676-4cb3-a216-3a0691dc6e8f.json and https://artists.proofprofile.net/proofs/artist/277ab7c8-3676-4cb3-a216-3a0691dc6e8f.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 0xf6d6a01cac65da73aed4d3610b98fa436e55c20f7d156fd9ac92e2addad37415. 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/QZN882185223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda5aecedcf00d4cf3f99e9835bc1d3531d963c6b48d7a410dcaa658a32ae385f. 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/QZN882185226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59769166025c6b324b81a20e009ecbc2bed88418d67259e161a484491b026170. 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/QZN882185229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb6d2e84c7fdfc94ed068f40fe61abef978e57ab733638d27a6eb3d87322f781. 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/QZN882185240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e02e572379eb25b3cb66c5ff03fef05b19fff0a10b0af0ccace668da700a683. 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/QZN882185248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab7280d346b8e4579c31416b4e4e2fb651825462731644e2dae6360275609db2. 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/QZN882185225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0002220ccbf4c0174fb690ec199862c2c1197eb11c5f6e7a8180ebbc0a26fac3. 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/QZN882185250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x523d71c7a06b931ac433998f41e28317fa808ba47d087195198270899d2da844. 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/QZN882185237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47571a763a9b70851ebc69952935d37889fd5507072609698386c340dbc54a98. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZN882185244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a6940dbbb6ec818df5a7899aaf20b05ddc67eb98f4fef99964d1ce372c1672a. 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/QZN882185233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaf1c29ebb340512c3a2300061ad10c438d61efb2eec34eeb001e2ee6fffb995. 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/QZN882185245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x172832f6eb4aa391da028dddd455dab7e896611ceb06a62f85c519accb60e2ee. 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/QZN882185227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x159aa0c4e5cd9aa963b52487e043dac93a1590a7efe2113b021940e998931731. 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/QZN882245315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x716264517d8d073c803da504b7096b1fedfd7ebaf7b916f3127591af5e366194. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZN882562564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c1a96d39faa4b4390a3fea15ada8602e207b7c34a61ab453a59a9b516517e0c. Chain 2 (Bitcoin): anchored in block 958863 (2026-07-20T10:27:46Z), 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/QZWDW2551253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x115cf9cdf88decb68b9532e3e8e8c3c3e8af11de75be3e114e0fe5c74b3d1126. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZWDW2551254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa024ce2371b52ff9d8eac58453449893f3df24707fdb41522b69152eb7e62911. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T11:19:23Z), 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/QZWDW2551255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41f739d6a40d3304cbf4fad8e8a428d3637f64fcd3d83d70fd9f3a8bf830f9f7. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZWDW2551256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb209e1cffae4e7e84e90b0d5c33cf6d048a3bcb2b7b111f1035f8c8ceb578def. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/QZWDW2551257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3670e3e42c0e024ae5c90c7cb413ce4ac63e6cbc5b326e2edd90d2a1303c168d. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZWDW2551261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadc21e4801954e8d6b8201209e9c579a343231da8047ddf7c7e2e95b29f12bfc. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZWDW2551262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa800f8017d83e8396ee2f80bfa9b76d39aca3f6f36c5aa9154d3129a54208257. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZWDW2551265.