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 0x20d5242b78cddb560499f25b42c963cd0b986ae8eb278a1a5ee115445f8764c1. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5b2c1db3-57d9-49ab-a85a-8e80f66d021c.json and https://artists.proofprofile.net/proofs/artist/5b2c1db3-57d9-49ab-a85a-8e80f66d021c.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 0xf7bb70a7a840d95ef8910c2dbcd9aae424164bede1ac8891d4107343bbaeceec. 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/QZ9452005567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f72e4a619c66964c0f2120f1f3a2432220c30b49c231d7f52c3afebddb72a07. 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/QZ9452005568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c965e9dd7a1db30f54578252e595b3438a0c8e0c60942e3c48cb5ed64ec4503. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZ9452005569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4c2f2cefe48d194f13b138438bc6cf057144a818db7e3e916697a16d208b054. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/QZ9452005570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd63514a90759f8d1b60d62c4d9be2fc275a00c7dcc0a8eabda0fb979bb4d2460. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZ9452005571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58e8ab38ea9aee1a65c87ffa7f424580c26e04559d409e075e28198a6087effa. 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/QZ9452005572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabcfe90f9502a389d044ed1ff4af447b79bce6155c85f41bbed84f7d24fb76c0. 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/QZ9452005573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5782d90b16687699bcd9bd0261b3998c8717e3b206f1db109e33f24ebb239f87. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/QZ9452300737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x798f33ff6122850a98ffbcbd8c28616cfecc0521d8e7c50a46a9fe91895c1185. 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/QZ9452300584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d508cfce4adb778644b377da7570cd37aa63fd4883ff1312160b88ab22d7717. 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/QZ9452300738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefce435c7df5fd8a1ed64d627c2a9a2b94f77e88897f128edb4675b8af506e6d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZ9452300740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x798f33ff6122850a98ffbcbd8c28616cfecc0521d8e7c50a46a9fe91895c1185. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZ9452300584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x569628f73232f7d9edc066b6090abc5f9657ce7466ca2b639e0ec790ef3855b0. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/QZ9452300512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x745062dac1423e80599fe70be95435837b889b2f8521c4ba396b97bd46a12c54. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZ9452300058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ec354038d9a1c541ae964bc45efb1928c20d13b6e8f489b071fe3d1d8c40628. 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/QZ9452201409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39065a25a23e01868a575e392912db531b7c4e7925791579acce7eeee91da713. 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/QZHN51973782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45aeb1baf74586fed87fd46f190396fcf52ba65e2a3fd895d03aec2c53beff00. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZFYY1946040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x647e2c91772d0a8d187920eb846ac7825a4464b529e5709025d354b9efee0cb0. 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/QZDA61958851.