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 0x4f034f13453537da6626e46989070317a1de4d3c5d38b16bf5f7d529f1529a01. Chain 2 (Bitcoin): anchored in block 953754 (2026-06-15T06:45:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/aefdbe0c-f068-44be-802d-1644d1067118.json and https://artists.proofprofile.net/proofs/artist/aefdbe0c-f068-44be-802d-1644d1067118.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 0x7f8396c1e8f43beba73b4a8fc44abd69cca320a65f50f66b5bea58101fc119e2. 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/AUMEV2446224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b687e4995ed268f4e5c5080295cd71a392006402c4c59505266327784bab503. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZNW72403877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34d13cc4cf5b3a21fb1ff2746bf5cab25c2c737f8a0232a1b9f5fe9c7fc1c025. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZZ972465824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2122322a0837ab3fbd59cc36dffd33ca7d0e6ba4ab98e8c416bb250fefd13b5d. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZTAY2385523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa43fa0f10e088228d3330a006797bd2ebe7c10d940c0e459abd1da38414aaf16. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZTAT2379265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc8420b4af614a466ac662ee1ecdb4ed8173dedb5bef4368d0804704e42f9d9c. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZHN72371662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbfc3e4f2aa7dac42dd41609277625c2f10d66a5f2e389e85cb0972afa7a02b2. 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/QZFZ72301892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50edac4932775f7ab5af1782ccee4cab526e9cc0302525cd35b06bdabc7008a3. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/AUMEV2447085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45c1f40d2ac3f691e53c12f6712547ab48e29fd413412e38527ac40b09682934. 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/ESA012470561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35946cc6904df3beb1564ce21b7742e8562def6e89e216fed458bb52314728ea. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZDQH2504715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b0ca5a00ab3ea0ce4755ba0ca4cb5ba6abc1b8bbd39d15d9775b2dea36d8696. 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/QZDQH2502215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04ce017eafb6e624eec0ac73bcaa894cc27588aac7fb006b47ad06fed40eb19c. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QZDQH2500793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe504b654ed6c221357f4a52b0098ad69863b47da6fb914872f57570b5bdbb2b. 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/QZDQH2442159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf19c2ac5ae6b1dc9ca9dce343982bc7545e264a50eed3b42462f9af85d356c38. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZDQH2436843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee9dbf77a6d114df571dd06617c0a891767574f93ca315524aad52db68e46acf. 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/AUGBT2461118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66713638abeb62c406048ec7e4f530e1ac221415742948c5be5ba36e18e69f05. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/AUGBT2408954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39c48e7e5d53e06e7c0bfe6aa5fba712269739a757f8205acd530a79290047cb. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/AUGBT2408942.