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 0xe4ddb9e2e1cd207f129c27fe9d76d5690af783ceed5610292ef62f8f36965f7e. 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/15306075-c124-4e71-8088-7aea6342e340.json and https://artists.proofprofile.net/proofs/artist/15306075-c124-4e71-8088-7aea6342e340.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 0xe819e7eba001c538a1c90d690c0a95f4e1e917d42a70d882da05f0ab3c4a959b. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/QZJRB1968937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95eee5f892bb26566f7cb7fe04fe41611cdc76df36c7b55e9e87fc83563b4ce0. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZK6P1969105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe1e149aa1e80806737497932145b335aae73c64d31d679aecb16c717dbf61e2. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZF8N2015997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3cd6471c0eccaefc534ead0862b190ee6c642c577e48a21ec3e5a9885a09032. 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/QZF8N2050544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4db547f5d831d4262da1a9903beae1ee6af6324b0b7ef5a064b1b0afd315a63. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZDA42024138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3e8a758ba0e526b5e050a2f7c2173cb57f56bffc0c33475171fbb09c42497aa. 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/QZDA82071941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f677baf75614cb3d66ee97d316c9b46af1ba604f17e709f11b6f3890639cedd. 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/QZES72030266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4a5f32d9558a864d651c80546ad1adf3807609f4891efdcf1e7d572904667f9. 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/QZHPJ2048549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1baa00728664a508d21b9ce6cd42c9bd462b95f17b57f635926c2b83e4a711d5. 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/QZNWU2154197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe25f594d0c40d7cba3be86bec008905cb89e68ad0c08601f8a4fb9c2858a388f. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZVEM2357331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3e5dd250cfb4b8a5811c20ac8d7d4502c51c57b72b1293f69ba9ac75ab42d71. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QZWFU2488872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x192cc8a2a9f832adb1a015d59c73071c8c2f649e148459110e4d86a71db4b686. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZWFU2488873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd4a1e77b7243049dedd622e34c9f6ec0239077c5fde2914de6f485e5494eda3. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/QZDA62581628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84be8e7f685c61f073fb9b673c1aca090bb7bc0a642f0d0ab25bfcc58e5b863c. 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/QZHN52534013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x016f3d0e578f65bd011fa4de0c102ba1d6d1a5016ee4e0b4b9c8f6f12580827e. 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/QZHN61915600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4405042d3fdbb8c2cafe3c25602487e9f8bac6ba4da001c8303efdc38cb8d97c. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZES82223404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb185acdfa5a8c9708a70e5ce92846a554edeb05c635933aef290da458bdc6001. 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/QZ5FN2392876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb1ce42f64567869983b9ec0a3e879353271b89f488bf72099e0dd799e085e1d. 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/QZMEQ2135681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x149cc978476ea1b81d19cd4b5dab84066793704bc4679107125287104946f3f1. 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/QZK6F2071977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39becc9768477c1db55284689718f7060958fa00bd22c724feca1808910385f0. 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/QZES61913893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x215038843b59f51b0cd4624f08e1c32a1bc9d7a4d025e3b23d339fbb0cbb97ff. 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/QZHNA2208002.