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 0x447fcecc60e4ea65e9cb89b7080696038366223d6d9fd4dab18fcfeeaf8a986e. 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/6447d90b-e02c-4e39-a627-35f2bb0ace17.json and https://artists.proofprofile.net/proofs/artist/6447d90b-e02c-4e39-a627-35f2bb0ace17.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 0x3c459b7587c62fa14b534003ba2b0f6bde29de28799a07c6d934ddf23e4460c4. 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/GBDNH1700033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6bdb875f8807d6eb4fe73d48289b1076cdfcce31ac8b15df3d809f9434b7125. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/GBDNH1700049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70edfb82e616dd21d0d05e919e7b33f2643ccc381512f4a2f34cb1c24886cf73. 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/QMMZN1801682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddbf07201d3f8bb0e344d677866b5d2b68602180cb7e106dde997b6e69320511. 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/QMMZN1801687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb857247caaa3e398df4043aa071f5c9d60f3c3f701fab8dbe4c5c3a42afd382a. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/QMMZN1801608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03c267a88521c32626c64effee94bf8e6af60ea541128b41d9b9580684cbfa50. 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/QMMZN1801691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1ecbacecf07d8f04dc9e4a9767e1c26fce773e5b7e600c47f6752a5b10339af. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QMMZN2302541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58d6d72b98ab0148645efa4cbc4d4120fe356dbf4c28f372d8f202173087a51c. 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/QMMZN2302540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1ecbacecf07d8f04dc9e4a9767e1c26fce773e5b7e600c47f6752a5b10339af. Chain 2 (Bitcoin): anchored in block 957671 (2026-07-12T07:35:31Z), 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/QMMZN2302541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07e71efe2d08cae9b94827024294864cee15bbec4ae723eab6ecbf46891ec24e. 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/QMMZN2302542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x113a6f034dfe350987ff95f0f07b0d6a2f9b140b99d4978c290ce5ab3962ccff. 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/QMMZN2302543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfa77fd8de357b15d1cbae99f149717626aa5620d3823f312a61cc3252d0bab9. 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/QMMZN2302544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffe7bceb2de20e0af13d29f26903595668e8cfe749ba2404b2c24593a91fd751. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QMMZN2302545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30333f7146085d9469d993358d080fed56814339730564e109064a7808047152. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/QMMZN2302546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44ab968858f186767308bca5cd683c39f33438e560bc9ae34c300ba6e17bc81a. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QMMZN2302549.