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 0xd2d4df2c421d3c6fcf3809b519060c6e7cb414ac75c0cfa14f949f01d399bf30. 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/41f992ad-6da1-4309-870a-00bc8f54284c.json and https://artists.proofprofile.net/proofs/artist/41f992ad-6da1-4309-870a-00bc8f54284c.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 0xb64db0aee1a0263f5177560ff02556383c5ed92f61c1667c173cb4e747eb055d. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/NL5UZ2504235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e68c04241c594a7119437a8f2b557f4a4f8753d926cd295adfcbd04b3b91dcb. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/NL5UZ2504236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f66cfbf2f87fa440471e5344186392d345c1a467f24c5f547d34f3871e51847. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/NL5UZ2504240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75456ad0f698d61d6dbf85d7a6eb8eaad55136a736bacc7819074086f3536ae1. 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/NL5UZ2504353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x175a9ef73a0f6602e162605360064f31fc1d5f7b2c39ac1c2bea9369cc771a11. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/NL5UZ2504354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27df769f9497248893901f256c3bad28dfa528ce0203c3cc0e433817899a1ce3. 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/NL5UZ2504358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2f69fe928456f5a7f9001dc6935be8ca48f022eed20344ba3d1f3fb78a1c85c. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/NL5UZ2504408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b529d1b4fb0eacae570324d3107e1a806aecdd1a75c0a965d436b9590eb8881. 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/NL5UZ2504409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a91f36edd06b13b7c4aaf142f077bb08207c942fadd9ac3a4721f1ba3bb115e. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/NL5UZ2504412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0cbe66fa49aba32aca732d97a0301610b9de229311c132170e38317983c401d. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/NL5UZ2504413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69de9a59b04a71fb198837389f0a4e2d2612cbfcc5ff06573ec6774edf5be04f. 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/NL5UZ2504561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf333652ab19dd22df1e8ddc28ba29d85514d83075538c2b2a7380831680997e4. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/NL5UZ2504562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc8b8a695d1cb6ffe04eb84c8b1fca5d8d4a9a477ae144c87597bcbe754cf37a. 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/NL5UZ2504663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd200b3275d3c1b6155de3d33be485ad890022673f54c4e0a3429cb734f851660. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/NL5UZ2504665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52a8e3cace272670c85b6e053a9e6318163025e2a72d2ac519360a2af5071253. 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/NL5UZ2504666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e6af3bbc1f8b036c5ddf77bd19c292b08debf823a98c03b6a4b77555872738b. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/NL5UZ2504778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7901b4da8974492db3546cef68d86d44f310334c351cdf419c33d675213e6c25. 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/NL5UZ2504779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x692015a7acd867c6539dbc282069e4ecdb745634036f2934255be291e5314c40. 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/NL5UZ2504925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08cb5604fc037a6413fc820819efd9cf742540cbdc99da293671515791c7b206. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/NL5UZ2504926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb083f3ca1f26cc8cc8d9285183fac8368d344a053c3b00bbda9469bf2b4202ce. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/NL5UZ2504907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0322711fa1dfe6fc0c549e1687fc0892609177cd61c7867bc2788ae98c0fedc. 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/NL5UZ2505193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcee4252314f2c6b80846c7453104b6bb11ba68379a0c2f3b69f405c3d12bbd40. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/NL5UZ2505218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e01f66de5d83499a4e5f5a67618b491f413a58605241ead1a28beeebe9bf56f. 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/NL5UZ2505219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e138cff8fff1b411ce6d0181886f9ae492da850b110c284338a77a697810c68. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/NL5UZ2504905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x916325f8bfe8135572f676e26891532bded0751d346e13579ec938e472ae6c42. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/NL5UZ2504407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2f69fe928456f5a7f9001dc6935be8ca48f022eed20344ba3d1f3fb78a1c85c. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/NL5UZ2504408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b529d1b4fb0eacae570324d3107e1a806aecdd1a75c0a965d436b9590eb8881. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NL5UZ2504409.