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 0xbf7aa2f8ecd064a352b0824f62de9b0e8d6c1cf8864acde7da544bff50e46f86. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5b41c370-4aa1-48c3-83c4-a52d7d573d3a.json and https://artists.proofprofile.net/proofs/artist/5b41c370-4aa1-48c3-83c4-a52d7d573d3a.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 0xf55409ebc89c4e686e2529e924d45bb790f092ffa497cc5e97307aa34b84c98a. 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/UKR6V2410637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2ba8289d10aa5ee6e5fc4cd7108f51d36c3a757344552439c68529f4e2a6bad. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/CA5KR2425851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x355fc938330a1a2364004fbb057be9d3a76b5b40c219526fe6761c5e80225848. 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/CA5KR2425853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83acd0ea2bf9d8bfa54e1520d9f70fe370fe897358697e16ab123051f167661e. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/CA5KR2425854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc95e74fe62bee524b7c146e244b6c68d5bcac6d99b287af10f04f7ead5805dc1. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/GBKQU2387847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7448482d904df93a14aca4519ce7daba01e15861107adb637326e0fbc2d8dfe5. 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/CA5KR2347104.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe7a47476242909f64891c41938f80d0da7c0764f1cb20c1d23b5a594c379ad9. 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/CA5KR2334113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bc28e385f3f564eb7cd995a2cf20bbc2d929721d1348c584251bd60c808972f. 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/ES5052200446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x755b77fc745997ac8fb2780a915e51d976cfb8bebf2d8eb7be4ee9bacc313f29. 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/CA5KR2272676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a55e6a7e638bede73d649044f8077572ce93bd33f5b61a7d1ed59d11eef7d94. 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/CA5KR2442863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c0db8fbcf4208b25257dd07a913f76dd8d812f474d5fe82b755fb1a6c93b8e0. 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/CA5KR2425005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a8173f6aff2c7085f15ed3bdfbeaabbe8812bfe7ec8a80e8e96643b26966cd5. 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/CA5KR2425006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x278e611092d8298772651a1624002c06cf06249a0af7a6877cfc8d049aceee0c. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/CA5KR2425007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefa5d37b8104e6033b3e58ab63b1c4c545b00c41893d7655f0997542d6ce037c. 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/CA5KR2425008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52fccc2d2cf2ced6c76aa50cd488467989834f0c4ef5d37a3e4130191ac24832. 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/CH3132300613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06378eb8abbea44dc87b6037b098df7469aac7693c2049293599a529d2ca2dbb. 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/CA5KR2383645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb49d603b97bd9e00f430c50243ce4b06f2d630e84f8e3a2cb557d6b402db75d4. 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/GBKQU2388102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc672072123e976bdcf38913e7471cb8818296000608f52c9ee125beaca8ca3a9. 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/USATE2427701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd621ae0209d711612679255aaa788b0f4cb9574ab6637800cd4c87acbbd57e7. 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/CA5KR2498889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8832d5eb2efcc475126fcfcb328eab2d53067abf6733e18c05aba4f13832dcfe. 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/UKR6V2410725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd41550a5db19030f1001d7f5b9eea522b1beed657618a9e62a0715a3a6f73114. 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/CA5KR2514965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50a5f933bc66bf8354d5cc488088f4962949f98cacb4dc46d6bd2a8dda50a3b8. 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/CA5KR2514968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd01b13cb903d2c4eec5814e60bde51cf47afba1051cbf48d188c4dbc3a3c05e4. 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/CA5KR2514973.