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 0xc24102f5cce308ef273a37b55d8dfae16cbc21f7ee968f27607a9cb152767fbb. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5b95a4f9-8553-4ba8-a2ab-7c153944638f.json and https://artists.proofprofile.net/proofs/artist/5b95a4f9-8553-4ba8-a2ab-7c153944638f.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 0x91945210e67e09703b1a91a609b0e32bd0cecd96c2a0ab2e4d9fb4a5de1cd9cc. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZWFR2515962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff6c3b296796263f3fdee95bf83e8582dbf42d2a3c35e6cef1bee7ccc1d2bfff. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZWFT2530320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e326accd1cd65a1bdf16be1f40a92f7ea15e15a409c5796b90982414595b88d. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZWFU2571407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7947cb580ade3b9b757375e2966808aa0f28966e31f751d3396a9cba02896f56. 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/QZWFV2572748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x938be75cc842fcd9525bb4f82f8810ad62bf01668679881653a1a67868d1f67d. 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/QZZ782537038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0a9ea727d959ea0adcaba3924c444e07c16549273d1d1f4c968bae572150a6c. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZZ7K2575021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e1c19b063fef1fbc2a9fc59b9c038d9972e43939619fcb4863d73fd411f9790. 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/QZZ7P2586811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda36bc81d80ccd7ce26ab328c70d046e4e15c46fd987e5456a5ec8cf72d0c8ff. 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/QZZ7S2596233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x406db74cbfa8cd163badae031d49db83896168259e5a5b1c9bd9133c9557cd97. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZZ7U2551422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9423e52fd8957a245b15c712ef7bf8a2e607c7bb615b1130b44c1e704d17f859. Chain 2 (Bitcoin): anchored in block 957794 (2026-07-13T03:10:12Z), 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/QT3EZ2547015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8251448534f5fa077b880863ea7b591b85f6cd3861db0cff099c03d74dd0434a. 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/QT3F22527252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc442f40286cc673bb8ab26de5572cbcd005eae42318a1f1b6d24e8138051a130. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QT3F32582613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a3847bfdc85b542b8551e1f526e9eb35c04b975c463b69a13a1b77ef863a419. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QT3F42561386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2862a0e2a3e0f8ffad85a9f351c2f77e9028a164ee667c48e429e6055ce6e75. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QT3F52542320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5085eae9566c2143bbca4fdb353fd5bed171f31a3e9a059703c4bcd988848ab. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QT3F62570373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45d9c5a000bacfa4f4885cc65b956217c67fad76145dbc8a2b392c60a1555455. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QT3F92566006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f6175fbae8635006f82de113cf9243ac1c4f008aef866261f9a4dce7f81a355. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QT3FA2583229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec426484d197d6d8206f53ff38bce469f1ebb768ed96128f1dcbb5d5cdbbf988. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/QT3FC2599856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7f48f5e3acdc33d7d902d66cfc073814f18e3f3f602b167d0c72b1be3322b25. 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/QT3FE2522362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68c9d54dcf1f663d78256c3842102caef9b9ac926354aa39910a4f0d73605519. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/QT3FF2521221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd02c1463f52184f4a639526d7149168a006aa549511c98bca02bfacc7112de09. 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/QT6E52579642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8bdc3427af7b6bccbeac8dfe3a9c580c7d016c756a4ca271999baf6b7930df5. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QT6EA2520336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b30a63aab0846c583f9d6534598b7cf5ab38f04f37bd2a241cef2707304768b. 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/QT6EA2592016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9357db523b08b66e75977398dd64da555eaa89b26ce766760292fbefb994110. 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/QT6EE2575179.