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 0xb0515044b7f0ae1a7b00761c87de2ab84619654eba5ee29dc26697512cb2e68f. 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/ba8037ee-b62a-4e57-a75b-b21f0ce64ff8.json and https://artists.proofprofile.net/proofs/artist/ba8037ee-b62a-4e57-a75b-b21f0ce64ff8.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 0xeef2a1b4cd74068b54b111d7159c97d59f83122dd000cf3f52edc3ab56a80af3. 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/NLK810500072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde9141419cfaf3692854685bfb7bce1eb1ef39c34f61482619276cfe55087a74. 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/NLK810500073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdae8d54c6057cb5bfc3a7c1d5c3ba5c33102ef75d331026d8fdcc018554b4536. 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/NLK810500047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3772e5d30e4dd107433faf489c12730f7edef835214689362771e3bc331bb2e6. 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/NLK810500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3544ee429d3bcfcadf00f2fc4b23a15b51be323675411272272a2022830bf1d9. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/NLK810500082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfca68aa1d2c1f705da93aaa5b24fe4fa5cc9e57442df37f8ca34881c3b283a62. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/NLK810500024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7d157745c70b160fa14fe85097f28e434587befae2db889990d362d00e958cc. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/NLK810500088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e374a981f5312fcb0e430abbdb403d782e986a15eef60161d6bf259ae25b7cc. 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/NLK810500139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcee05f80f81c11ec64aa51f1a8a788ce6c22b7904542e0f85d527562299226ac. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T14:07:17Z), 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/NLK810500146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeef2a1b4cd74068b54b111d7159c97d59f83122dd000cf3f52edc3ab56a80af3. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T07:31:19Z), 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/NLK810500072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcee05f80f81c11ec64aa51f1a8a788ce6c22b7904542e0f85d527562299226ac. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/NLK810500146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2313771b89259ba34b61819e995be8ef8fcfe6e6928c653e16a2e9aa4084e0a. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T07:27:06Z), 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/NLK811400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdae8d54c6057cb5bfc3a7c1d5c3ba5c33102ef75d331026d8fdcc018554b4536. Chain 2 (Bitcoin): anchored in block 958776 (2026-07-19T20:11:59Z), 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/NLK810500047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3772e5d30e4dd107433faf489c12730f7edef835214689362771e3bc331bb2e6. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/NLK810500002.