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 0x45f53b3d70a9e55a04b4a0e455f1317b86a456287909dabf47decbacf9555bb2. 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/994d636b-683e-438a-8e2a-41b40bfca854.json and https://artists.proofprofile.net/proofs/artist/994d636b-683e-438a-8e2a-41b40bfca854.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 0x0bc5540d21f449d01311c55a127896ab53d2aae30c805d037203a76ba82814cf. 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/GB8KE2151543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75ee1e8e8758c90f829705f9c7e6129a6394894dbffc2b758ee2e2ee93c820c4. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/USLZJ2132440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8090e99158511aa3ff536f9e9a560880b6ba8e99b108289a17c4c990fe4b115. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/CA5KR0014257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x324ccbdfa93e05d7b2b436a36e5325db670ea6e8c75fe4c3224c6b627a97ac42. 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/TCAFY2182216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd465944847e963e3f4c7797b43622a9be4dcbd090b883ba748d420108b3b814e. 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/TCAFY2182231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7364c1a9246beb4d44c89ed8d8ada8f6d0f455fc3d88f63ef9442ca7c1e9b894. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/CA5KR2210364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bf10afad68dca8d30209d68baf2c4b1693414918ba0cb9b9f728b27c372db0a. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZMHK2392527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca2108d4ebe36c81e24e0b96d7d8e22678c9cac7126c8d5ed44cab6ad134fb6b. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/QZMHN2300466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bfa343715006a93df513e549819dd8778ca0d86757953a5e7807d317b314a77. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/QZWDD2330430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7d7393b88a62e03dc8f8c0aa8ec47fc6f5a8bcaa0a62ab915e36294017671e4. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/CA5KR2377674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a2172d9b18878dd90fc582ebf7c83e32c308606be7a8a070b59eff17a54c8a5. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZZ8B2348899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2891e55be57cf0e48b02071e63fee8ce4f23040e7ef96b62ff2785d806cfc9e. 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/USZXT2455137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88d328084d66dd1943bfad23cfc95e56ed19d21e7cb2c4d1967ec200937ec057. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/CA5KR2493618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2144d895024353131877c09af82226fbc6ef2cb3bfd747d51ab0a1654aa882d8. 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/CA5KR2493619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4e6acadf995805e973e5183d91a4d6066d24cda9318367d305d6e8f05c63b1c. 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/CA5KR2493620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0581d920d08f7a4da9b7b93e8cffce6845ec37922c1b856125f3875390c64ca4. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/CA5KR2493621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x725c62b14d5914c7bf668f5d2e5a91c38ebcd5301e550d16a6a7eca8c30df2cd. 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/USA2P2347127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8617480fd54de768c64bd2744ab61647993761b6251bbe297a8eeb333a2a3d69. 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/USA2P2332563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2891e55be57cf0e48b02071e63fee8ce4f23040e7ef96b62ff2785d806cfc9e. 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/USZXT2455137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1cf537e93e12c93618657dcf3fcb7e8398db27038e7d46bc10cf523eec16f2b. 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/USA2P2403012.