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 0x2dab788ce680526b0569b46469cb5ca2aa4c8c7dedd39931b59940b1f3e11391. 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/c1621968-238b-441a-93c9-c98eae37341c.json and https://artists.proofprofile.net/proofs/artist/c1621968-238b-441a-93c9-c98eae37341c.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 0x80a95ee514349a2b6276c59746fff775c50f728ec244863424f012f6d2967b45. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZW9L2429856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc51b88f1892d8b192fff844e30d93f34e868ad897c14bb1c3576018f9bdd801. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZGLM2576725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5989d4999f0fc8d262c10cd915298ff54b1b1b56ab74c0ab726ca1ffa3ee3aee. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/US7VG2517049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99be50552f3968550a6552df3316bf7ddb26da2e18c4e22d81b954d7185ee157. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/QZW9M2438884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcca203e5535708c7b378ddcc83bbc38a7afef0d628641c48cb9890a2e765a5b7. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZW9M2438908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50e3be32c6d8c4d361f5643a060b43a19606e65664c151ce3c4b8fe554298e2f. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZW9M2433293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a4671f8048978962efafb26ff087064ad0e2a03a5635a714f3fedc10513abb4. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZW9L2409864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a7d5aa828f59ec54c350eaf83e25a9a158ebfedf92aba685542b7ff838ea3d0. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/QZMZ92591208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x626892822192fad58edb4023bdfd625bc1513d6b9343fa6032e662bc1775b344. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZNJV2561300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f8ba79987c91f6fcccbd60795ea9a2678ed29c7dc427d946945cbf02723163a. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/QZNJV2510975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8778d4e8087601d1e236b6ba43e119493c871896d33b057e3a24907b08ead12. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/QZMZ92566235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeea2ee7342001cf34db48601985a45a443f1b4af0aab7ea744e2316e593d13ae. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZMZ92576290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28c09600399b72d0eb864b007cc22869ee51d163b3b0e9d9a1fbcaf6628dce3a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZMZ92562384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7598c12e430b12764d9ab127a85a2157bb218f063ba61496e30d86e8d8ad4ef. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZMZ92566677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5430ad44755cce570eb837e1641681429ffef2b498500a481c4cb66a8a09b28b. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZMZ92511236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacd7c13b30de76d8753006bcfe67c1be13f1a7b145b14c189906c28cbfde3f65. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZGLS2547089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf32099065505b7f9cf580388473fc97a664b922bc99fd9d5650a7910a4a3555. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZNJY2409184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97e043a9139de63d601e2c56aa217c1a75fe8ae259e84a4862d0163b61ab8225. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZNJY2406286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9d94f018b2ca6133660903388d86fec289fe69bba0d22e12043d4426e420679. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/AUMEV2444815.