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 0x9f2b7bf2a7a1694cab2d5436fd389326eaf44cd18a458c06f431e1a05b972228. 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/cfe586a8-d12b-42ee-9dbf-966f5e8279cd.json and https://artists.proofprofile.net/proofs/artist/cfe586a8-d12b-42ee-9dbf-966f5e8279cd.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 0x028f131d08ad1e92341c0b5c3cd115d9cb76583174207b67433fbbccc8f38174. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZHN82226342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6037e4dab7a7737bd86adb942f1052c37828d7e4c306336f9bb9395fb96f02a7. 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/QZES82312458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8758d3075c8ab3ee54ec89260d63f32042a463297831a2aaa7f702442c373abd. Chain 2 (Bitcoin): anchored in block 957583 (2026-07-11T15:53:17Z), 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/QZNWR2344024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x517389d143246df9d3d834ea411d5e02b1c7100efede00d3b2c9ae0a9720a306. 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/QZFYY2421888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dc938a9fbef14622e84a00a511fd62d598d8a1e368070b36f1bdae356a87142. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZFZ72437790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e4dd02036cf01a30c9a9afd7db9eaadbedc6f08aaeac8deb7527ae261118e2d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZFZ72437791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb80497433b04d4767a63da540eae52473aff0abd3b41c9f100549eca03d3166e. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZFZ72437792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9797a1e82bfd6c39512199c7c9c544fea741996b662d57a876af1947250dc21f. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZNWQ2425756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd58a8dc98a5b2a5afac46a0263a50c1c3c62a42bd839c2ea0642155a4a69a9e0. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/QZNWQ2425758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb86b182eb7dccc6fee53e49b8e932247881f6f609a46d6ad8a0c3be024ac7266. 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/QZNWQ2425759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2af2bcc14fab75333964f36906475048c74fefabb21f9fc4ef5116890a935a88. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZZ8A2418056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e51e2fe06125406c3ef058170a14981d12c7c54d0f84f54009b576b89262694. 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/CA5KR2504771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93a5c2ba41a3eb9de20e42d459472535159a05485ed5dbd4f58218583c9c2e3c. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/NLCK42501427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a8b4ca5e7ed40104cb2958c07a39cf52109d55250cf91830465e477d9a138b9. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NLCK42501428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07578809095fdb6229935f3f1714c351798201b22dbe0bc7138cf7ca9573cf5c. 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/NLCK42501429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0b6be1c80669b7ffccd624771106110dc9c3c896050313284ed5f0b3581c9c1. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/NLCK42501430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d59ef1fcb14410056cc5a37e29805c22c8fc5d89d86568470976f059c01b9e7. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/FXR752501529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8a3fea0b23fbb6b43186492c81daa289366bd63a6b357234ceb7702655ce18a. 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/QZTAU2596419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51c46bc4d4f631e417a3a26af54a5c0b5e969d7cbfff81053b17b67e17f5b5bb. 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/QZTAU2596420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf29ccf922ddbe40cae8bddd787013bd5c9b4ae796e12d6fd0e956eb1e7c2a056. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/DGA052513611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x062ea4cbbb8cc6a4ae0431a5bfeef7761e3c3ba8c07adfb2ec30d2278d9c2038. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CBAUX2402709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20be663bf7542a181a59c4f3601b927737e4d51e8bb9a94c9501acca5670a89c. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/GBWUL2489123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1e91e01d2ef4acc6b5e483a8e0e0a874695c3b7ffde2633defca2ac3c5ef847. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/UKY7B2000053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e51e2fe06125406c3ef058170a14981d12c7c54d0f84f54009b576b89262694. 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/CA5KR2504771.