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 0xd0f376c1b4ba768f26f1719fcac6a4a1d0b3a6f03c8c7b3a3c2e2f325c7ae3e5. 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/c154a6db-3a49-4e86-b681-4be50c0ea5ff.json and https://artists.proofprofile.net/proofs/artist/c154a6db-3a49-4e86-b681-4be50c0ea5ff.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 0xf9fc8f8c2c376947313b7ca30f1f8077816bbcc7800aacf23bc0f510a10099d7. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZHNC2143179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x473fb6a71a6866fb18a341744709fcbf27cb5a7c7f82014326ba3d6cb746e5b9. 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/QZTAU2143397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97e256de657c066cc2cf0bc9407d984c2a39baef709e77d413c1d67cfddf20b6. 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/QZTAU2143398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8809f602ef53d9276c4cf8fa16515c7a23fab043fdd0811e2178e5706b81110. 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/QZTAU2143399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58e93f302300640631eeb39c998e75e511868b44ed1bb20827f3d60ce2726dfe. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZTAU2143401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e96cac39e652cb0f29b341af1e57b5bdc0d34964155983850941a57ed944eaf. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/QZDA42285297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8787ce9b57ec394ff5b25b9a60fa9fea1f922d16fa1b5a4963d3246efb2b5dd3. 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/QZTAY2292566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10b16ad06eeb3d391a4723c4996ac2253a97d3f7f7232e4cb3841fa5ad13d90a. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZTAY2292569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2db69f8c7d71982ae191046e748f8043e546634e7936c73d7e7a8d5d73a733d. 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/TCAGU2357970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8847a47a09027d825fbfc4e64c5c9be6ff1dfbe354c0410366711c93c3d3655. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T20:13:58Z), 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/TCAHF2341676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x681ce52bef07b07debc3c12b13fdc906aa32af9164b531791cfedffb640d9aca. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/TCAHK2378786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a253abf9fb721eb374942f773ec21052c764b543ce68d58e3d561a66f838c7f. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/SE6QE2420629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb3a3c578224ed2264dbe618fd72820f5ee8b5e48095eb30698189968e03e718. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/SE6QE2420630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x514ce4d2342f2399cfce040c1ec74298031e55f536a3b589a3e0474271ea5753. Chain 2 (Bitcoin): anchored in block 957573 (2026-07-11T13:43:13Z), 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/SE6QE2420632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe98d0e396a8d4ba3803d0b6568e03b2f0a9ab10e00aa09be9d8c6e725bc23d3a. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/SE6QE2420641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4704acdaeabdace2fb54c03b4ea4dc38e76e783b9e72e5db851251ccbcd479f9. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAIH2489826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc67a4b820e55c269c19c46cf577214a7c45706c9f4c5a81fa28a33c0cfe2bd2. Chain 2 (Bitcoin): anchored in block 958051 (2026-07-14T19:14:42Z), 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/TCAIW2491115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21155053903482ba7531f23700e3ffe2c4bf891c765eff0a3bfed85335f28cb1. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/TCAJG2526533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ccd1c68a4cad554fce626f00f4047e749e1a3f2bd471d79a9c5438377844d22. 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/TCAJQ2578162.