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 0x9c28114fb61539bfd01c4f7605511238fdcb82a1cf0a03e61100e795fdb05d61. 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/e9fbc108-56ec-4cd5-9aaf-eba8485fd85e.json and https://artists.proofprofile.net/proofs/artist/e9fbc108-56ec-4cd5-9aaf-eba8485fd85e.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 0xa0d44caefd0d22387cfc1fb2264b9e8ec56f43c42a8e45590f16957b727aaa63. 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/FI5CK1701083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdcdfa6c9d5dbe04fc9ec9fcf6acfb02a2aac446145062baf8952cf16fa58c10. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/FI5CK1702441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5820f52be01bf0d65f24d5e1ad698b6ce63aca67539a6ff3d0afffb6354a5d02. 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/UST8K1725696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x988e81f01c88a5b0976e15c93766de1f5333c2101d3ac79a5a150f8cbecd0c16. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZ9Y21744838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1b5a6360a44658c7d00b291052d428a1165476fd6f0d2cf538c7eb7c11050c2. 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/CAHQJ1863294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x225298c23334a9662dd56a71bcfe7277bb49cb77f54cb4bbacd1b76d492cecef. 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/CAHQJ1863291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79527bcf3cdfb4aec1e049cdd9667dfcddd582fd4662b9a49f5f6c5d227cec55. 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/QMEZE1916738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1e06ead8610089acd9766258f554d637e15fd7408ce5d9cd0ec25871f9b7d80. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/QMEZE1916743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x253ae5652dac5bf9e0ae5bd3622bfb8923bca43adcbdabcedc74a361978f1fdd. 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/UKACT2030380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e20c6c5a4640a4998981208a2feb64e645d4bea2dfa680bee04a615f9c19e2f. 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/UKACT2030381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5f3da2ca9ea3bec18388318f21dd3e0671648eddae4e58bb14ad105a73ecd11. Chain 2 (Bitcoin): anchored in block 958889 (2026-07-20T13:24:39Z), 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/UKACT2030383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x636e699a41d7dffcfbb20339bbc43cbfa1124383647d22c377d7bf75f4fea56f. 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/UKN6K2000301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2adc414b4a4030dcef68fd5e860cf12316d9a9bc917f15bd405f592018e42252. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/UKN6K2000302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2606225a36d02aed0f11b145bb69ce386da48ab574bcc874658cbb65241189f5. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/UKN6K2000303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8e518c039bc156aefb6de567be84cc242a567289b565c24618d07d931329ff1. 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/UKN6K2000304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f006577742fb6d1c678c461616ce204b3f03cd393d8865c34ad1fb8a802e5c9. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/UKN6K2000305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaccf2d7632341acd54e4aa011b63b42dcec2af71cb7c0e0a3b83a829ca8f6eb0. 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/UKN6K2000823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x200ae53b5f3c53098b87d6068582122d3b7eed2df8ba6e053bfda681e7979446. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/UKN6K2000824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafb69183336a7388e2cd3b19ea317537bafc75459ca1b05e4403447a6b385443. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/UKN6K2000825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x701ea839e265a50df7059e9a2ba7c57c11a9b370172ce964d6b950c4c61fe129. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/UKN6K2000826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x785d27a74847353e6e0da9ec6508d9e2691bc9e14a521e5436c3f66b18d9b9c2. 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/UKN6K2000827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x728f9bbb1f44fc3637610d0bab24b2c8900278a13aeef53b586163dac000e19e. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/USLZJ2002368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0eeb041453473492349f62bf8e493dd9eb50f8a12d13d501a9db7b5b9814f34. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/UKN6K2001075.