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 0x2e18e5b8e74410308151446e265f3c29700035b32c93e89c39a6d1f2ba47e5a8. 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/3b0748c6-bd7c-444e-9921-4ea9eb6320b2.json and https://artists.proofprofile.net/proofs/artist/3b0748c6-bd7c-444e-9921-4ea9eb6320b2.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 0xc3982bd02c81bf7df9f8d79c52b583beeb4c12708c9da2932a04f7f1ca431b3a. 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/TCAHA2334614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6bf08a116b229046c65ce0810cc2b366b1bb00a3b55e96c44ee221337dabdd2. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/TCAGY2324082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d358fd0535660eddad6cdb1a7a2b90fe3a6a3aab0413f484e9fc307fce9306c. 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/TCAHD2357323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3721490e03570c2fa6276a93d218fc95288ee8c0beac7739b47f274d44c420fc. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T10:09:30Z), 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/TCAHD2357334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1adc54129db6e0a53ac62f90f448f6d01e02bc68115fca47f2fe70bcc7066239. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/TCAHH2378809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d708015a383821f7d29d2187adfa46c141eca99950f5a9d3ad65b1e66f1a08d. 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/TCAHH2378815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18bb59bec5b5f9495305a557a0643b54677b6ed720184b47543b2bcc21958059. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/TCAHH2378820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66b1aed80f71614c10e8ebb95ed8bdef6499e4017ba9ca0a2364f2639c911076. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/TCAHH2378834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a8790f11e8c14ca42fdf84ef7952ed01cd1bd30d60c25a5a350ff8f0636e450. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/TCAHH2378847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52dfd4851a60661d3ab15fe40bbeeb658fe60107c9a019f30edddf698f7a8fe5. 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/TCAHH2391572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88fa073fa46ccbeff6fd51aa26ad13c6694a114db586bc3623da3de1499d7c77. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/TCAHJ2368359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5659c4bd94b49f98cfc39f08fdcb376e00580a907914a201efad8a8195db47f7. 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/TCAHO2302986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe65f781a4e53fcc92eef5dd1991192f2c6961084fc579175e50cc638ddcc65b5. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/TCAHR2337183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d3ca70573f6989f38dc5a138d31578a8da16864a7cafd5af7769709de6ffebe. 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/TCAHS2345313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54eef28e1650e3776c3297394c40bc8ec2fcaa27df12431d289189e1a46e12bc. 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/TCAHU2452051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc608b69cdacd6f39211e6f8827e4eecb328fdef350d9b53f473aeb496ad2e817. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/TCAHU2452053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61fe7bae84e1488fb7fe15628a49ec49ee7b595450e41031920adef7e186a913. 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/TCAHU2452067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6ed315f2e8de30573d074d85bae469944d1376387a11d415015e228419120fc. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/TCAIJ2458499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34176850e9fd7fbaa58b4c964b0f1eb1f088e93fbbf653b68ecddbe867646c99. 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/TCAIK2452495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ca0f503fc41cc0e1d7e039e2771bc1d17e368b64bc0b6b6fdab5f93f17318ab. 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/TCAIN2415407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59bc9602cc9cf279e51a11ef4f5ccfbfead0359f7dd0a40cf4c550b16f433468. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/TCAIN2477874.