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 0xdd95e7c7de77667e69bbb385f3ca5bf1da7fdcf74d513d70411622f57413ec71. 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/9b2853a2-e4d9-461f-a4fb-188d4b7cf32b.json and https://artists.proofprofile.net/proofs/artist/9b2853a2-e4d9-461f-a4fb-188d4b7cf32b.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 0x20456698209cf101d50cbda8f3afcb32ad2af60c518ce83cb23da9eaa3a44598. Chain 2 (Bitcoin): anchored in block 958680 (2026-07-19T06:04:14Z), 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/AEA0D2195439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c9b1af1d0eef6d7e27b198a37b40d4533716487fa06af54042d20277fb13707. 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/GBLFP2373958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75b5d3f0add4222315e5869f03c9167477fe83562568290092733cd7a24ab5a7. 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/UKXN22366438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x840f224703d4ac04139fdd122e2c4cec767fa8b825b268718f42da2e2a13ef8a. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/GBLFP2456678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x112d8035814e29e6dea1fa6c44e23c06233e0b75b9c1251d0a31986b0862d9b7. 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/UKXN22432574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45348dcdc08f647a7e1eb9f607d7cbe1c67ce596d73f083290264c69f1216fd6. 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/UKXN22481974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa96b14a93e59d21de3e66a0980ddd6d14f40196cba0ef8e11ac8acdb4593ac0. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/GX53U2339620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd654620e5d9523c4252ea7b777bcbc0c2693b1b5dd55c791966d59aeaeb1a62a. 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/GX53U2339621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b12def871eda6f87add9064f8f751f1c54ab962fde79c46a541e6b6f286a6b0. Chain 2 (Bitcoin): anchored in block 958474 (2026-07-18T00:59:09Z), 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/GX3Q92479080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x840f224703d4ac04139fdd122e2c4cec767fa8b825b268718f42da2e2a13ef8a. 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/GBLFP2456678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4262633fa24db4d1a8efdb0410324854ac24b36349c59f8f41129746c19d7d9. 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/GX53U2339622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fc73d4b336c0332ca1d08f58fc876d6e60e01d8eba2ac53972bf1bd29fe7aa6. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/GX53U2339624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f73896fe3ef3f76be4aeef571f087354d6502f4dd953ae6a9c935bcce7f9cb3. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/GBMA22374955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x112d8035814e29e6dea1fa6c44e23c06233e0b75b9c1251d0a31986b0862d9b7. 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/UKXN22432574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45348dcdc08f647a7e1eb9f607d7cbe1c67ce596d73f083290264c69f1216fd6. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/UKXN22481974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaa7316405fc2c0fa20171cf5762b31f4a2593a95d61a0cf26e7267b0bc27967. 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/GX53U2339625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb92e780650e16f5bb59a4e20025e2d2b30d15ba87690eb1855b440a0b51ec02a. 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/QZMHK2314723.