thumb|A species plate from The Crossley ID Guide: Eastern Birds, illustrating different plumages of the red knot A field guide is a book designed to help the reader identify wildlife (flora or fauna
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 0xec52f989cb6249a6392e393fc5269173b096694ff588342307524899797ae796. 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/d06b0653-50bf-4b55-a2ac-3b5bc791046a.json and https://artists.proofprofile.net/proofs/artist/d06b0653-50bf-4b55-a2ac-3b5bc791046a.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 0x8996c17e6a2503ab227b27fddd444c9f18eb1b306bee8fac0d2b69ce057247bd. 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/TCAED1924990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23ec9ed1d7619b3aaade637e82a740fb22a22732b577063ee3ea6902795c0060. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QM6P42037637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b57207634f8974ea28191b7052fb846070adb5fba5465c2a423d11fe307639d. 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/QM4TW2129714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b57207634f8974ea28191b7052fb846070adb5fba5465c2a423d11fe307639d. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QM4TW2129714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x045adf00757046c4f83c250f336046b99cc035a3de46b7991405e7edcf539a15. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QM4TX2171950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf55df75c50977ea212547d8da27a436a3a360926ca9bde2aed7a1dd99ac65e01. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QM4TX2171951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5155b0830042ed647733aaa382bcc0e1be80f87d9801d7904cfcc38c647e3da3. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/QMFME2044327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x509c3002aebfa51ac4859ecee4f7729fd83059de12f4d728407d19369da26213. 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/QMFME2044328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x564bc967c7111dacae36370b270aeff2f64f5459ba6118fb0c5fbcaa39dfc3b3. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QMFME2044331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5c7ea344458471b93dae93bc9b6765341b7b70faaf81516e87d3496e59e0d22. 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/QMFME2044332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17f53b76b2dc936e1a7e851908f1b21f5086f73942c18c7238ce72759eb1b13e. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QMFME2044334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x532f3b573c31a5384300985270c35ef89659574ad7bcc6daeda99e914753e822. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/CANRM2200124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29d6fedf1ed54ae4cea4e0004591147258312457a7e100fbfe0f3415e5728982. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/CANRM2200125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28eb86396aed0673e47284798f65956a1cc77799f9f188164594760dd83a7314. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/CANRM2200126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a986b42630e4228c072623ee42a8a91f858d6ec25369f147aa6c24279cb4f82. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CANRM2200129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4697eb1b1f492f810ff64669fda66b45ecf299f0c92d8e090f713ca311966993. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/CANRM2200130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a5c2fdb4e3799098b153437ffa5658b9ea9da17d38dd489bc2900a376c32544. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/CANRM2200133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe85c3ada2b6f9b61a657418fe823c7526e450790cf1f12f2e5f7c72232ba166. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/CANRM2300180.
If I Keep Seeing You (OurVinyl Sessions)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x306b83b5329591e2d332bd30b4966ec8f72b9f4b67e30969882a0483c638c01f. 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/QM24S2303512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe06f599b9fad971e6114454d217b546b7e5a3b8a5ff8271c07ecfa86c1c8245a. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QM24S2303510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28257a94400ce99339b72c6586719e238f2aaf1888402b360f7b86ef96ae871a. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/CANRM2300290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18abb11d2bc5589b2988d3e66870114f1619cad2f3991ad35a3ecce7d62df083. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/CANRM2300291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29139e99839b7043b68e532a2b791556d0923c6f7f777a7e4cf240a7947f66c4. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/CANRM2300293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34d771e07e4f521d22bd03cb898c2c96756481cdd0d278a6df50f4aa527a5e20. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/CANRM2300289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28257a94400ce99339b72c6586719e238f2aaf1888402b360f7b86ef96ae871a. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/CANRM2300290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c8fc22d123ea449c6103571e2ee345bfcd4774979151a33d67433f005b9bd5f. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), 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/CANRM2300292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeb4a014b07984fd1ef1f2d915582847f5f7cb26ecd08a7267afa24e75c6404a. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/CANRM2300294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f2c6d007e2f22f8de25f55de2e5f36e4247c08430aed2f82854e007848142c4. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/CANRM2300295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4729e19e9a922e79fe344f34c82e3a8e1e819e4afd8516a03c5e309ab03d4278. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/CANRM2300297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4ba521b174974a5dd50b5dbdf9d889f3f2b42f761713585d9a3482f90d0c0e6. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/CANRM2300298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe602ad5caec11ef879a7b85d942aa54746eba5fef3e702485d5c6bbb1de700d8. 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/QM99V2411004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fc7abc77994a77f216bc23e2a97a6f021bc7a875098edc8c2179939a3093fbe. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QM99V2411007.