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 0xcbd14f1eb7148e512835c436ef553943c716e79c9e30d03ac29f0c560b2751fb. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9e4f4f05-00b2-41d4-9004-f952eb62a7a5.json and https://artists.proofprofile.net/proofs/artist/9e4f4f05-00b2-41d4-9004-f952eb62a7a5.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 0x99f25ec8b76829e0b3497a14b7efaca939e5ed5bb753b8a9983aabcfd926d94c. 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/QZNMY2477938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd92b1c0bbd139a30b6109f4891455fa336715df0e33c0ab5ccd629b1106c3096. 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/QZNMZ2427084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf35b2b29d58af2f0330cf4a3a1a8909bd99ee40ef550d385240fc95ed608048. 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/QZJG52516555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x962494ce585e031579f77072fd78f33eaf1b4e66d76e7b4ca0e3e8af49e252cf. 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/QZJG52516557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55c37e425918c2eea4e681ae353744a6d6af8810410d3be71d9ce747d29d67ab. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/QZJG52599050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcca675fbe12d95346fac1ef057b74cf3bc30c6ba35d1186b502f74f7db9fab14. Chain 2 (Bitcoin): anchored in block 958963 (2026-07-21T04:02:02Z), 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/QZMEV2581073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4047a71daa744011508c6262fe75ce8461157e15469b1a2d695d2c4ba3be357a. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZNB82523562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96b27c6237237da4e36b5793734abe876abd627327e1ef889127ee8445e78d46. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZNB82523564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7834394835c3983930665768bc76ba3b19959169f31c73132023981e8b8dbaec. 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/QZNB82523565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf26cb23fe2334c35e38c1302a91f2eb75099e805b95121e7004f360296c633f7. 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/QZNB82523566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42bfc8880a03072430354be8dc15bc9bb58d08725a81ba072fbd19bc260013a3. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/QZNB82523567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51cf4d40d392c1aaacbf77f24ac645522bd99d4cc3bb5c67bd80158de0c39245. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/QZNB82523568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5396db2af7cd3f7155b12547492c4b7e8693e0be9ecd3a426ce579882036a18. 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/QZNB82523569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06140a9d86e797e43d462d9cac68ede2e8c4397d83daacbdb6b5bd52d70abad2. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZNMX2507181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac6c4eb8b2b89d9399beb17d527def1a019968e173c78c8c408622b8d1c23756. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/QZNMX2535570.