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 0xe86454f85576d2510c4402ca02e46786c68f428b1fba96e301c9710a0408fdee. 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/28309e40-e075-43dc-a461-7f1a21f9aea8.json and https://artists.proofprofile.net/proofs/artist/28309e40-e075-43dc-a461-7f1a21f9aea8.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 0x96b2330589df34303ad5e8588509168e392ae3395e40f8ef50527c7234977f1d. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZWFN2351178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff61dd7dbd9c28e6029fe565e0fddaa1a0d673228f6fd627b66eb1215e32ed0c. 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/QZWFN2351179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x412c3269076b03d6121d401859934790e3f4da05570f67d0fcf466c990e0654c. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZWFN2351181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9c190f865386cb97ef9ac553b6a95e241b541d645a6e59a994c8dba0b9eb6a4. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZWFN2351186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce785737531010ae7dc926a89c35701d1df06b13f9e1ef0e88c55dc2b441a753. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/GBRKQ2044561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02eeb37dda234d627fbd9b48cb5a594fdbee97f4b8dc8b00eebf62eb5e5703c0. Chain 2 (Bitcoin): anchored in block 957668 (2026-07-12T06:54:37Z), 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/GBRKQ2044564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e2cbf8f55fe6c24b3abace397d1a52aa0c4d5f7b538ddeb2e159f169f7ba03e. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QZTB52216997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a1619e32c743ca3247314e48622751e849244afad9c882f5d390b5bc9589568. 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/QZTB52216999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82fb4d5aff1e6745f550c32810d6123b2810ce7bc9464085bd30043f9fe8489c. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZTB52217001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc38a4c793edcd00aba8abbe94031cf02c1fae2d890744db39d0c7042df658601. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/QZTB52259263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e2161acae3f3373eba4251e4de13bea35079edcd1864e9298cacf078e028da0. 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/QZTB52259266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x574cd8e7fd562004878b75f1fbd87c68e132c9ad1b3b152016e4aa51a66876a4. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZTB52259267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc3e48a19952d09ef4ed0c561b65a5840402ed80f3cb8aac24d0e0f77de67c1c. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/ZBYCD2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2cb95b6d98e01f19c75f8a1d39acc948dcd086a13bea57573a9e849b7e150dd. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/ZBYCD2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f7c1f3c51d01aaab73c53da270ed66603fb922f0cc8847599caa409daae5c8c. 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/QT3F42522578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96b36b6684d38e2f1100db09fdcb89871efe101d4acdc15eab6b65701c8793cb. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QT3F42522580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87f8d1933e76dd68f87847923d91f47f8e9b48896f7d13a677361035b42331e3. 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/QT3F42522581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0930847098509e0b7c5a40c73492ce02cdaf69beeec9657944c5fb58f9f337c2. 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/QT3F42522582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6342ad6784f7723f41066487cd8e40443f1cdb2737410823208b501a2d7d4465. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QT3F42522583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf71017f774ed59145a7aa986947e5de5256e8b7a0af9b2ab5654258c46204cea. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T11:19:23Z), 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/QT3F42522584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaff2c5885276bf3307c048c867cfec3c7a94d357f52a324043ad316405bc94f. 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/QT3F42522585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38f04cd8872733007d820716f51cf607e25d469b69d9e7c55527eec0c9c53190. 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/QT3F42522586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x012c260a9461897736508fee6b660e7d359eb68faa66a8a21dc236d95b058c95. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QT3F42522587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x575249c75e669b841e7f8100d781a682ce0960cb749619ce1324f731ae36b097. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QT3F42522588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb14b0a3fb0b5f6d380416cf6295a99604010c12041bf682e6cadc8830817598a. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QT3F42522589.