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 0x074fc1ce263a369c29a7089cd1b1ca892ff2d47d01f3a3da8bed220a79e05db7. Chain 2 (Bitcoin): anchored in block 953782 (2026-06-15T12:13:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d581a867-75b1-4cf4-adb0-5860416bcace.json and https://artists.proofprofile.net/proofs/artist/d581a867-75b1-4cf4-adb0-5860416bcace.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 0x1ef1aacb63cfaeb6f63c147d1cec2b39b38b57516fa14b27c25c94907b2d0b74. 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/DGA0L2301360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfadab93000a8f48b54ccd90bb6c5d8be66bfe932d489c943870e6c06495b643. 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/FRX202037242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c1d73addf9216ced6b4f34359829963b2150ba378bbffd461b273d1361b8e9b. 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/DGA082390107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93e8bb86a24f65b3be9e6adf98593ee09f1191bb3cff0dc15881d6e8144fd1e2. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/FRX202037243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95801530e26fb8b74071ccc54fbbe150835c0a5112b1a1476f6e127791f270af. 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/FRX202135549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10a0a13a36a768e5625415288a47efd7ca985ab9cdc512a034078d7b5798e212. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/FRX762087006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c3b7ea28264c8c1ee6b4bb9b08003af004d3172e8fbf5c3c93f2231cd580baf. 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/DGA0L2301361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d71bd2a0e99db28095373e3b58f803a4fc05edc76b78e7bbe51be6a8bf55f4a. 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/FRX202037244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8f0620fabfec5e8233a9a1c7274054614d1475ac54252c86dbc5c31d86e1c4c. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/DGA0L2301362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb284c24affeeaae28df5a5d8cdc1582ede92eeaada90093a9c5d0ff3b7b01f94. 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/FRX202221645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5065ef0f1652959538e019fe599ab9a863726cb9b901c32d170dcbf1aa7aa287. 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/DGA0L2301363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4c1dae294b0a781a7d91978aec883507a1d81fdf24a3bcb1d0a44dfa744c170. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DGA0L2301364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b95f47e98d7ee2fbad5ca6561a23ddd25b30801f2207f34164863837084be4b. 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/FRX762219380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd031ff52bc698c5cbe4add566de9a77ff31ceffdb15edb3bd264c1e9c4df90ed. 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/FRX452251082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x592cb44493964af1eb04ddd8446e96d643cd54bd98af85a4b24e588d0fadf553. 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/FRX762219381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x101f02327a015c60f7775132535e55866170f4a2703381d7ff919400811894dd. 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/FRX762219382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19fadafec4da3fcf0edac9ea2a5cf02956b68098a74000325d0a7a7329ee1a62. 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/FRX762219383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea149988fcc98978e07437ca7bcae3d1a92ffad4af96c87a0a45a79aa9fa43d2. 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/FRX762219384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe743eab0f8d27cf7a473e8e5f6cbcff9efd80acfc6cdf2e418fc436c93aa2fb6. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/FRX762219385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c1d73addf9216ced6b4f34359829963b2150ba378bbffd461b273d1361b8e9b. 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/DGA082390107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd031ff52bc698c5cbe4add566de9a77ff31ceffdb15edb3bd264c1e9c4df90ed. 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/FRX452251082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb284c24affeeaae28df5a5d8cdc1582ede92eeaada90093a9c5d0ff3b7b01f94. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/FRX202221645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95801530e26fb8b74071ccc54fbbe150835c0a5112b1a1476f6e127791f270af. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/FRX202135549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10a0a13a36a768e5625415288a47efd7ca985ab9cdc512a034078d7b5798e212. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/FRX762087006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfadab93000a8f48b54ccd90bb6c5d8be66bfe932d489c943870e6c06495b643. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/FRX202037242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93e8bb86a24f65b3be9e6adf98593ee09f1191bb3cff0dc15881d6e8144fd1e2. 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/FRX202037243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d71bd2a0e99db28095373e3b58f803a4fc05edc76b78e7bbe51be6a8bf55f4a. 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/FRX202037244.