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 0x5303b63ae759e1bd512e6f8d6e14e1e32702540b21de9ad678330404a44b0624. 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/a4ca826b-da92-4e6b-8566-69248a422b8d.json and https://artists.proofprofile.net/proofs/artist/a4ca826b-da92-4e6b-8566-69248a422b8d.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 0xc11283e30a12c77c92b8a0499b9430e284f0044a67cbac100ad120bd10a7ef35. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZHZ42168976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d87444641e116ab4dd5a556e64f0ad0ed2ff3f59c842165398d5b0b4a173327. 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/QZGLS2394405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ba1ec81c95f6dfee3d4fbd7c31212eb536f90dc94d88a3ce2b58d7a942d6002. 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/DGA0M2316692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24cc1c55f79884460fb1dc0b0f6203c3a1699d51b18633ede059fe6274e4a983. 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/DGA0L2388093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24cc1c55f79884460fb1dc0b0f6203c3a1699d51b18633ede059fe6274e4a983. 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/DGA0L2388093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef4034162df0714619b14f059b39074fdfd621ece72d118e7839e323e92cf7c6. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DGA0Q2399948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0da2ac5fe73f0b870ac3d59ad9ac4a8de77eb645a74f29b1fc9d36269114522c. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZNJW2376613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d87444641e116ab4dd5a556e64f0ad0ed2ff3f59c842165398d5b0b4a173327. 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/QZGLS2394405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f18709e8972a4cf31a2f2dd3803b899d6e802d4483f2e1945d06b58ac088f2a. 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/DGA072369450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ba1ec81c95f6dfee3d4fbd7c31212eb536f90dc94d88a3ce2b58d7a942d6002. 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/DGA0M2316692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2ee091bd8cb2e9ac6760d73c6e48371b163f39aadd5091ffd298d8a4f54c4f2. 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/DGA0Q2399949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaea089eb5f1d90f6b254f47b03970cce96b644b48e021f4d68fbca025e6b0ffa. 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/DGA0Q2399950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba67d1e8421e7b9d1163dbfdedef2940e63900a316b944beccbd4b4dda5eba4e. 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/US7VG2341662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b07255b611eda058c8688bb227ad91ae80d20beaa169cfa7427480b8965d72e. 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/QZ5AB2347166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d8e82143f8e3a5a76c9df4c2ea14d5b8ecc19aed7ac892b413afa2519b6fa43. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/QZWDD2224373.