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 0xb17a88b735a31cbf366cf1c9a09b95bc0904661d50abbc85c38c05cd63e13d63. 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/879544a8-e339-434f-b0b8-f592440b4c80.json and https://artists.proofprofile.net/proofs/artist/879544a8-e339-434f-b0b8-f592440b4c80.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 0xf33394c2f1c3b055075a1a32ec67c248c07aaf30439856c39713b1d6cd3a1b36. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/ZZA0G2401761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5980e2315b5e64b1ceeac2a021a64062cacda2ccda9b0bf3c0a51bfda492c820. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/GB8KE2321533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a43f64aad69d94fb244636d4195266e7ba12eeb12e0565a4624b46906977a93. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/GB8KE2323172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb01b448591cd9afe3ce44a00218e8de6d06ce443b004d10598519da37ec5c0ed. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/GB8KE2323210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c5c27bbf5f5266e88470149f5780cf1aa5a1c0580bca4f77e63a8e00853eea5. 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/GB8KE2400349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb85f1f9783676117dc43cf9f00e3a13ac2470f7e620573561d0159ccfd37f384. 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/GB8KE2407045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b5eb8258a7d6169a6bbfca13c2f29b76966cea86e78e48055cf40404d348122. 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/GB8KE2400376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eb74476812eb856a8b82f486f66c9186a3b1d952579e36d2281a45f7eff890c. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZTPX2448941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae2d53a2504df201a316f2735af5cc72248d8f02832e8cf93094a03fffc5c65f. 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/QZW9K2429353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41cd3ac9ec4a2d42470e6fb2954eee04ce41f3372b6e35a38c616369ba506bf0. 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/ZZA0G2500635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfcc5f98ed706060b60beb3b648db00eb4db1f63dad46cc18b1fe6f6f3977b40. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/ZZA0G2501981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92c5d39bf0e7bf82ec290606e9cacb6ea3ec94e4d12160d176cc3b356c2b48e7. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/ZZA0G2502784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad7b1c14f84942da76d1b0896121be378936b4cb062c1644c2e6b56b62cff5b5. 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/ZZA0G2502977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a4a5a95f95b0c9cee93acedd972ac5bcffef7e95796f040c7ab39b674c27187. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/ZZA0G2503298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a5df19f8ae3d1726c4c4634b7e97dde0fda4a7afc0c1c19f044fac988174c1e. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T09:08:06Z), 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/ZZA0G2503359.