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 0x3362aa4fdef1085973543bb95e5d57aeb50f937e04b394599e6bd6b3398213ec. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7486da9a-964b-4b24-87cb-39e660207196.json and https://artists.proofprofile.net/proofs/artist/7486da9a-964b-4b24-87cb-39e660207196.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 0xf403a60c8ceca6b7b9b82b6b18986b1579dd004375331efd90994ef201f3508e. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/NL8RL2435539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f7428dac428a2f46a99b8a934dc033e94690814ad697b2841ef4c6fd5c931b4. 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/FRX872351985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f0be61a77dd8df318b51ac3faa1a8a851b9b508dabefe0b65c1bb3d9e793012. 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/NL8RL2435866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x232a048f1ceec43f08fdfe364122aee5172c0858e5dfab3bb062a0f4de8d512b. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/NL8RL2435972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd53fe3551430f576e76fad1cfbedace366bab6662fb2aba9c133690371a41f54. 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/NL8RL2435978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc549673c56a7dedea049f296b51cdeb27eb9b20c20f64f90dda1e214014b9ea. 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/NL8RL2435569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d977114220ba044bb6a60682da6a1719eee6e06d2908a7aab55c7af246572f8. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/NL8RL2435930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7b26d2a1dd36e0400b22261abd0534bdaf47fa21f3ff90440bf4e3bf25ddf58. 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/NL8RL2435588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36c4b73aafdc69ea6b30e67cf96eef092829ea6673e8b3b2ef1cde86c73ca0fb. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/NL8RL2435558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x780dcb7b4eca4ad313cbc8950249c923b70b3fdbe6be79647210c0c4041f8cdb. 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/NL8RL2435523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x594256becaf3b5fc0a07cae499046b64265db661b8fd7f95b37fc7550a86c5fc. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/NL8RL2435524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1cb8c3a003ab77ab693071c0d4a0f3090b41ad7f1d2bceb23797f59be5a56a6. 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/NL8RL2435308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c0c1b0460b4c42d5042308ef02e77276cc3312ee943a3d6d0e3aa9c3a59d7ae. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/NL8RL2435310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc38779bb393aa2480841e4e9e580a1c40a978c53c80b14e0220e6804c1b40053. 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/NL8RL2435533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb049a7f4e0f59ce4ca0f5c5c29aa8aa195745b6a7bbfa6c85a89474221e1decb. 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/HKG732131273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fe875d0396587c32003278067453296fc46a9a96f41a853e8f64e5dfdbe065f. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/NLRD52134542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87c2dd7d528f2222631e172c78d72b26cbcf220a15fefeb86c77bb6a2dafe114. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/NLRD52134644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd850b81cf3e8f167e73018eaa4611238c65800dc2008be1baf7fe2900bb9e23a. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/NL3M12405381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x917b2f20c1eb1b7d6bb619b5063b5feae38c8e846e8468f8478f14033ae90b2b. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/NL3M12405383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1478e5e2672475de64e36669337b601345f028b975636755d19c67b4019a30c4. 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/NL3M12403208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00e42c16d8e6dff48397aa6c923d5e5ae5b67b8127532b038d2322f07a27d2eb. 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/HKE022211909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ada9d02696067cc98001f05478255d0869d012ebfec48dad701735c9e155b47. 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/HKE022211911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd42218f28bf90eb73ee6e263e625dbe395f500485ba13c665d5f5298acb660b4. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/HKE022211278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34b287230e13f493efcd763a5585bc3e031647d111c8f8cc1704bbdd8b887296. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/HKE022211201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc2c1efdaa3ea49104cb1b1e8c85c7536f57e2c85b39ed3e6cb72a253b36ddf0. 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/HKE022211159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67d51c849c6f07a9638dc26c18bc14a9f95c37151be7d6a6d6be5488d66d54b7. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/HKE022211165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x305e9daefdc2a8979d331818f177dd88852cd3f472a9baf0fb70164221c56899. 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/HKE022211185.