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 0xaa5029e05df060477b83a95cd56d145d8f40ffeb3a571facdad84383d07df923. Chain 2 (Bitcoin): anchored in block 953588 (2026-06-14T04:52:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/001cf7e5-6bfd-40d1-b029-81410f1a9edf.json and https://artists.proofprofile.net/proofs/artist/001cf7e5-6bfd-40d1-b029-81410f1a9edf.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 0x93b546ea854e6b3f6ee74f3312f6952febe6abeb57064d5946aaa82f64a7bf0c. 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/QZNJV2439833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe5d99ed203e6d30b91002df646363f60d395e336a4f6f27bd079b7dd05958e9. 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/QZW9L2312783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x352fc60affe68236397c4fac12c93760e5930194f363de3f0a33bc66ea7fa3fb. 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/BX21U2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fdd7c12053b45cbb6c4073955884b627c7feb015dfb5ad7c6804f44be38634e. 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/US7VG2303162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd67b839bfb9cfb2ecd0ecc54c81cff722d23e7cabde32e80824b8d066fda6d26. 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/US7VG2303164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c2792a4bff96f75fca62feebfa9beb2049868a52642e6ab24d20383debc1d1c. 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/US7VG2303163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f81a0a67d379543b9d64bdec7c51d2cccc3694d39392d007238534418f99e07. 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/US7VG2303165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dc872ed29590f335a8201c9bd36a8d853f98837d0403645001d262531771d83. 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/US7VG2303166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfb8d172f8fcd0443a7d4f745e20cb7596ddc380b224cfefa148f5d4dbdb4358. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/BX21U2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce1cfe1f8d7cd8513c5042b73df83909db8bc71eaeee4f69140c26f87eaf6cbf. 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/BX21U2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20e0b4750e2ed09cbc95618b2b415d08ed1d2716d9859f5b4ac4e9db3672a780. 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/BX21U2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x843956d4ca7995924dc980fcd78273aacfd7ae734dd941c30525bed268767773. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/US6QR2300082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0d903f02293ffe874eab17b2a22be3c1c2c8e9df309356ac16c0ab8871459d3. 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/US6QR2300085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd63e204700d8100a4d1be59268eee26976347aa39aaebcad58b7f552ce9bc63. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/US6QR2300069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x204b72e4518a9f353a6f1ba09b9d11d83887d664ac76f0bbfc7eabda2b6d4ca0. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/US6QR2300061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe495a5fc36e1bb924eb84e8ca905d1021aca816229155ae5e159d239c9348cee. 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/US6QR2300091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf13250bcdb4ebb4fe742523f14ada1faac215e9028f21641133bbb0a7ba6da4. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/BRTRB2076797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fcae89f1e160f3468d553715b0eed44ae173814fed7a50d26794e0e2a9f6257. 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/BRTRB2076798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f4eed0215f11fd58a3cdb973025b54a327c6a2fa63f5418a78f4fd2b8cdeeb2. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/BRTRB2076799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ab029d65b8ec8189141b61e9a63eec1e657b6ee62f9aec63e771d67a81591eb. Chain 2 (Bitcoin): anchored in block 960339 (2026-07-31T03:13:37Z), 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/BX21U2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81dafd57e4ce4275d6c9b3f3555c83ac3dc4c0ca51e3fe891c695b30e929bb33. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/BX21U2200003.