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 0x087b3297fa1a89fd057fbe6df8248857cfc097cb57d73c505612541bfc0081e8. 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/4b171e99-6a8a-44ff-9a1b-956f44081d3e.json and https://artists.proofprofile.net/proofs/artist/4b171e99-6a8a-44ff-9a1b-956f44081d3e.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 0xf07a8891012c2cf468c2f5a2835445af7ddedc1b28a5026dad6a30713159b976. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/CLKT21902016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd03a687d01142d74240db8c742a484ceb25c63a727194410dea416523faa46c. 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/ARIXB2100092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a7d734ba48f1619eee40e8e7cac36349cd1a5de841f8b6df7febdd8d2638a52. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/ES71G2330418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf07a8891012c2cf468c2f5a2835445af7ddedc1b28a5026dad6a30713159b976. 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/CLKT21902016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5956400745eba84dd6a7b2a6e788e3a91810c94d25c8fb5eda3c4801a3a08339. 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/CLLL22000619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf79022e133607d8f7e3ded0440fa128ba396e1dd67e08196a6fda87410d4efc2. 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/QM4TW2389129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x933531f0ec246300a3415f76e80766f935dccf25c6b8a0dedc84d48ca011b934. 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/QZNJV2429722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x995f72a8fdb41dd094e4acad80490e8545bd70ea4fa51257ffd77e79bc474598. 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/DELJ81807177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa6dff6cc9d34cb66d0e20aef0c93597022f9bfc9c0fe757226890dcbc761193. 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/CLKT22103948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22d2f9ec459f7ca10eeade9df6e0af591020c9e2f6b8d9807ba99aff78c76570. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZDA52536849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa662c861e127f3716ab30f840c9f0115fa0479545490fcf590238d4887ad4c7. 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/QZNJX2120111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1c75171e3278e842ebdd2fe1751a9ed62c879d4f80ada38082db4be152e2ae9. 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/CLKT22002750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ceb93c9adbd10c92077dc3c9a3cab98df83de0bd614720fb525396c26fb6841. 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/QZGLS2294063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b82dc875571ce4d37525dfeda624ce0f4f4178012f6d32f59ad308de1b89963. 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/QZGLS2294064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa41617776f87f5c58840e7b2c411cd88e8ab15e8acc001b47c63c43e2b2befbc. 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/QZGLS2294065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6a9fd27c811fe2031f189907c38f4b75f16b45697d603ff1fb962a8265114a5. 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/ES71G2306143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9f20fde365f37f135b993512e74169b6f340ebb5b8581a854b6370a3de5a156. 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/ES71G2306144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf93e037aca89da849a718db6edd822b24ddcbb6831c771543a9948b5a1a78cb8. 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/ES71G2306145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a3fa9704c4a57d4d703ebbe878a66aecdaa986c66347a88a8e0bdfd3673b50c. 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/ES71G2306146.