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 0x6879abf5523b02a929a462a5a4df951da8216847b902f6fa3e01a7d2a6753082. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9f6f777f-b4f9-4f99-889e-4de9397d8474.json and https://artists.proofprofile.net/proofs/artist/9f6f777f-b4f9-4f99-889e-4de9397d8474.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 0x4eb5eff15ddc13311cabe452237af394fd58cae95628056a724c96191c8e2c76. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/US3DF2445978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a906cebdfc59b52ceb07c497a2f7f1477c4fe0a05818696708ed8bdfe05c81e. 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/QZGLS2512269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c538a04fe46220cd39d3f2201292827dff83ce0ec36835c4a56c1e7ec3d3540. 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/QZGLM2531201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x247fc0b1e1919ef03d628edcb03ce8902811871f0d3278f675a5da13cbeeb066. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/GXBAV2575904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1869175ba9a7a0b58d9dc966f5d3a88420352d58ad684f4ea709d8b929471e9. 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/SGW502227439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91ac347c9efbfed7b1d8336a17561a948a0ecbfcb1ea8864a33bb3b403be3b0f. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QZNJZ2425783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60179754a5d50d60167b7c277aba8ff74d04518f94311f5d5de05b267e7157ac. 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/QZNJY2472280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c7dce574a33f859270aa9701846a0078550f972ba2b49905265f0bdd430df30. 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/QZNJY2430463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e68fbe797d7ac0d18d452a332c5110b63483a08a8f0fe9dc56c4da1a8764f29. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZNJV2446208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c0b94c5e3cebba7870828fc84077430eff554c9bfaebe7b1406e2aadcd36f44. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZGLS2465727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec290be8f62709f018eedea3e94d96de8dfb6f2d00c2f2d684b77a1579a1f2ec. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZGLM2478798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb89152be2f03afba4b04926bfb5c92813a5fa52c56d3108364a0dbe818673246. 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/US7VG2458790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59b8fdf60b7e91872bf59d9e0cd35f669c7b511e7eb8634c8177d5cf484eead5. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/QZTPX2397468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3601e851f549d7c2f99a371548afc9d46aa4b37fe3872e4fe4231a3f3c99f2a. 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/QZTPX2335528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacc61a514e1db73336809b369e14bf22145a8528f30a9a1ea2da634e0646eda3. 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/QZNJY2394476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb10117f7d977692f6d18cd63f3ba0b1084e3434e83daac4ef55625e312e156da. Chain 2 (Bitcoin): anchored in block 960355 (2026-07-31T05:49:18Z), 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/QZNJY2394499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c0c5307c78852add634a29fb15fcd729a2a342b6d5f46432799f0d7e6540a2d. 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/QZTPX2433402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d9f832c85395ef8c1d29be0c9a7a7d3d7a5deae94f4339baddc90a9f46fcd86. 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/QZW9K2310179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63b09451771df7649fde7466a7dc815501a91fdbfb5e0dcd06791d45c5986540. 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/QZW9K2310182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a5c35781318809acb7753151779c31fa2005230ac59dfba9d513139c1138bff. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZW9K2310184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88cc3611eda908cabc909c33c4de6995bf82e5c96b664511e5f47290f19594d5. 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/QZW9K2310185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x373cb475c1f38363f868964aa733ef857d147ec75d82b0594ededd8aea0b5c00. 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/ES18B2403383.