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 0xc99fc5e0f11aac51de10e2c74f863427058985e185807e253356efa33eb3afbb. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6022ee08-fa9b-4e16-bd92-17c547c7bc0e.json and https://artists.proofprofile.net/proofs/artist/6022ee08-fa9b-4e16-bd92-17c547c7bc0e.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 0x500efae55c311c34ccc0234e708d23210a1dc266715002b5a9ef2e66c01b17b4. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/QZES82136109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe5e7d0c6cac430be7e0ef423e5b1772160c7ab85aac674685e8c2af19fee026. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZES82136111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bec89b285feb887a25b21612bb8b470a4d7fb10c3dfd4a51afdcd4014d0daf1. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZES82136116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8055445f34df25cc5ca08d43ce2996e6f476bd8e95165d144dd68012506de2bb. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZES82136117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71b1abae5502c84fdbca51a3bf898c5052037a694f663fe9352aa292477cba87. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZES82136119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6d008b3a744d9130799dbc5e83031cfb03b7a0dfde678cca7b49dbb0c3aefd2. 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/QZK6M2163176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6d008b3a744d9130799dbc5e83031cfb03b7a0dfde678cca7b49dbb0c3aefd2. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZK6M2163176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x671fd54cbabcbd30abca93d6326f75dae5cbaf4e3a746b2536902d34ce855cde. 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/QZK6G2439880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e38c043a1a0ef53e54ab9707c1cd939488af62b79f99d7d872fa41cd1c467d1. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:39:13Z), 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/QZZ7P2433323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fb0630744dc1910209ee7baaa0dc997b0653220b9687409216d9a0172a6cc07. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZFYZ2558446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e38c043a1a0ef53e54ab9707c1cd939488af62b79f99d7d872fa41cd1c467d1. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/QZZ7P2433323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc51c6f12ba82d3239a2773ef18ee6b8d854e4bf720ab01365d0c6f5429c56f8a. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZHN42573381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e9a454d3e5c6e76ffff176b63a8206640e4dc1978024f26441cc00daec371d0. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHN42573382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30e956d5e670f79283a3b76533937bfb8284da7cbc2b034baee0d738e1246a65. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QZHN42573383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd25b7b2f03973312d82e14d06eb134001dee9b89ee8b4f5d6ceb256fb5e421f9. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHN42573384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1abc556829506aad657a0bd7d91572350aac3ebbebc68133ce46ebfa9e3f8c2b. 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/QZHN42573385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61bfc357f3d8363766a6582f7350dcb04ab35bf7d077f463365f6e79f689c683. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZHN42573386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc597c0f15d556d888bd86c828140f1c7865fda2bfe5e5339c3aac37a8caec9f. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-16T01:19:56Z), 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/QZHN42573387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf205301c3ce0de813593f5348cb5e71b0bd45a69ebf8b66704d784d1ca9ad5d0. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QZHN42573388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9acfcc1c955ed3e7772d0f24ada697869adb2e166b14de052b0f264745ac81d0. 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/QZHN42573390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd80ef45055a0d5008051597eb8c6728003bb7e17f36095402cf1f273fbd3fb3c. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T12:55:56Z), 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/QZHN42573392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fd637b54c653a1b9cf2912ee4aec6ded8b89df3dcd5c2e03b0eac31bfb68b13. 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/QZHN42573389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4fe85648da8b0dc586b92d5cf15be592d1e96e3740b94ba3365fccb9668358b. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZK6H2509746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4fe85648da8b0dc586b92d5cf15be592d1e96e3740b94ba3365fccb9668358b. 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/QZK6H2509746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c665ea6b4239f573797a9232af8ef289e8f95aa798dcfb952b4173fd0c5ba6f. 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/QZJ842504031.