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 0x8eac6666642578b30567558c8a429211be07c7d2caac2684772e43c6bb2f0cbc. 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/357de560-efa4-47c6-9971-cbbe2e0e2f10.json and https://artists.proofprofile.net/proofs/artist/357de560-efa4-47c6-9971-cbbe2e0e2f10.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 0xf7f314fd9998eaa2fe96886f0cb95c7959ab172661d8815b02afc2aabd54d838. 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/GBWUL2150437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1db3d7653124113816f24a9e4ea087d571a05e16f0e062a24b94ae9a6caa1d14. 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/GBWUL2150440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b908bf5dd86ef0c7cfa488e96b41970c0f6aba37429f2e4d88137cc18e66467. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/GBWUL2150442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x527f9e57a527315466c325fbf984a2c6e030f17613584577dbad673d2ac8d273. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/GBWUL2150446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ebc2f22214267972ef35fde98d4d52c94bbd7ae14d535896a8d13051ab2dc3c. 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/GBWUL2150451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa91790cf8d3c828616e631931675594381a134a4684882d9edbff3432c0bba5. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/GBWUL2150460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91066491c61d28d20d6fa20a6696043690e3d16d964cc1c4ccaeff24a09a56f6. 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/QZWDD2268232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9279ff9f3d4b276ea3e4c5a9441b115b0b7f00b39acb569ff00104951de36fdc. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZWDE2206692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0df9fefedfc81ed2c6b6500b190129cbe3a29537454b1883958058672161de7. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZWDE2206834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91066491c61d28d20d6fa20a6696043690e3d16d964cc1c4ccaeff24a09a56f6. 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/QZWDD2268232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9279ff9f3d4b276ea3e4c5a9441b115b0b7f00b39acb569ff00104951de36fdc. 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/QZWDE2206692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0df9fefedfc81ed2c6b6500b190129cbe3a29537454b1883958058672161de7. 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/QZWDE2206834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27a4fca5e9cbc51e1ccc9c85f09a51047c30109ec32f6b25c71e98fe9f25df9f. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZWDE2206903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec4a4359a57d508939cdb7b69fe07fdc1d8f007e05c193636e92bbee42919f48. 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/QZWDE2399107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa536baf7d0887fc41ebe762757e0ff9c0c65079fbcb42a557db879dd4cf6cebe. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/GBWUL2487997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d2df028bf28859a5bb6a42fc62cbd261315df0a58f0cd7ab76b2af2e6ca5807. 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/GBWUL2488008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bc374fd09651d8c583afddd895252a3c797610b1e93d8ee5e9d8305e8c41c67. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T20:38:50Z), 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/QZZ8A2571798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3ffab34572f771daf8aec612d7f4f98fca44df8f0c579f791cdbc9dc5195c0b. 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/QZZ8B2439663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0b785d3362bb735b57bd9bf4f0bf695d2989645f4ff6c091734a1fa71f6c7bf. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZTPX2141190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0136e24153c2e458eebd7a5243aa9f427944aba1b85c5e76a2d25a82466c553d. 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/QZ5FN2593941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a8faec9e2a0d04d2747134cd1ed83c2572c40b4eb194b34e1a5d2e701287f82. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBWUL2340062.