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 0x2f1f7ba7a5041a9deb2fcee08a4eb056656ce7e842b605ee49681fbf867fcab2. 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/c039ffd8-b4c6-4fc7-a0b2-a6dfc7020603.json and https://artists.proofprofile.net/proofs/artist/c039ffd8-b4c6-4fc7-a0b2-a6dfc7020603.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 0x67acbf7b67f1c31a2938b6e3f44f027728794805e29a7769e18d965374a51386. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZNWY2303894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87212a6469f97e213464d3b1a6ada67e5cf55bf9074ddf078703b6a137ff3f32. 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/USA2P2357257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac988a505bd26b41c6f55e9947ff3f794f6afd749d3cccbf9df50141c0585632. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/USA2P2357258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0acab473a994e1e0d6287f2b2aa28a7a0fbd3104131662fdc1b11590be914b3c. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/USA2P2357259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x692217e17030f47b4feca24d62044b07a93cddfb46368436b2ad09233dfd81a9. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/QZHN52448758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1edfcccc027e8c35127127e0a60b2729d243688d1c9b29b6032558f39db4e239. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZMEN2475751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe09863832f5230dc59454045e2ed0f2a5df2a188bd3362fc8d5be7d1aec40536. Chain 2 (Bitcoin): anchored in block 958666 (2026-07-19T05:00:30Z), 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/QZWFN2433231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27b0280248d60a6af6d874498bad906620d7e10a8adc8336d59724da2742001f. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZZ7L2406752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46fe51b8e3074cde84b7e977c0418ac40971928f77f22a385fd49e957f44b54a. 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/QZZ7X2492842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c17926cc52ff01ca147cb01c783d0b2ecb445987c946755fa854a4bcc54ccd8. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZFZ22523597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d8055c867f5273273ed7a61dfb727bf2c2c7745db8d62903a751b71d4a1e5e2. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QZFZ22523598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x418ad6c0326a6dc309e43c6292c2443b87fbaff4a81262cb963e6ec3e43cb3f6. 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/QZFZ22523599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32e710029e2413ecfc9ca5ce56563104c4eb4b42f49ed8efca910cc57a4ed8e5. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZFZ22523600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b2e05e6f5a6c69f14cb4a6f8efa727decb56ad5362fde76833d92ad180e69f6. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/QZFZ22523601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e4de97cf23e0412125d4681bd7f7df637e5d3e1deceae572a0cad51a33060af. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZFZ22523602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x813c07f9e74a0913e299dbb62e44af4455b4ecd59c3b44bcba779d4f6f4e261d. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZNWW2553723.