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 0x6e16c3da16be8d9180bf3df75ae182483fde80251fd02f793064f861dc653b04. 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/96c95772-4c4d-4f69-990b-9733142501fa.json and https://artists.proofprofile.net/proofs/artist/96c95772-4c4d-4f69-990b-9733142501fa.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 0xac1d9da129595e341eb4d9f7d13d60c824e35c15445b221023854094ec603da0. Chain 2 (Bitcoin): anchored in block 959052 (2026-07-21T19:50:27Z), 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/TCAEL1979861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcca14104ddfced91d60bc2f27f130a10e0fec7832f104bd2ba821304470faaa8. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZHN92042941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8ddda974637e21d539c1a4e002c5476261ee34d17a82740eba0182260e2d502. 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/QZDA72143066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaa136b7ddff43383ccfea6d10da28405beefd9a929be02bed0a041e14e8f619. 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/QZPLR2140909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x383935d18727a67a8d528d6994af1b61dac007a2e8751ef2b67cba22967bb5a3. Chain 2 (Bitcoin): anchored in block 958920 (2026-07-20T18:14:22Z), 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/QZTAU2103004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb0bbc39a7a652348bf36b09ed9ee2f5f86ccec8460db1cfb7399725f095129f. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZFZ62216858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb66dab7d8fcfc27f10a1d823a3534f177387cfc13574b292ced941ed241c1ca8. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZES82261393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x179d27c8035f7ea94cd80faf440dced3a573734ee966cca4001061652a64b7ac. 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/QZES82261394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2486d2977625437735ed4e707c0de1e435b85039ef156493b2b079704d26e37e. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZES82261395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5392e04cd021bc5f89be461d92bd78c3e7a6cffff3ab6d7ff0fe7fc5f4b9c29. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZMEN2245367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa74924fc9e3f72c886c9ca2f6e60f10d0ce777521ddb9b0fbcd4a81bc5ea1bd. 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/QZPLS2240503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe969777c80260191a6562ea573f116a2421424b5d532452a206caabcf6daa1c3. 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/QZPLS2240505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x059c268b992f57ee50a3a6e7bc3ada78418ee5b4ec8e5e95cac945736fc97144. 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/QZPLS2240506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b02ce1d6ef1620c1ed0c49264ffd5f5f92ea90b0277e075b7e1004c4c46431a. 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/QZPLS2240509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4dab38add307dc55b40deee7dd912afdd10691cf346b9c6ff3e38045a15f7c4. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZPLS2240511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefe509c757ff44e0d5a82c8174ae92b363eb804eca98fa597c87135c9472bf5c. 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/QZTAT2247141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56dbcd2d7437f43bbfdff88e5d1dfb6cad24e33d191561bb140666d1b4bd8c7c. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GX2Y42200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f675232f34aff8c631e47374ee5932e201e923e633e82c4079ae5bf8c92ea00. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/UK4ZF2100590.