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 0x1ca25910af4a955762b1b9a672ae07aeb6cdc968f0815130292fd4170281746c. Chain 2 (Bitcoin): anchored in block 953746 (2026-06-15T05:25:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a425131a-d67e-442a-a613-e7555f133d2e.json and https://artists.proofprofile.net/proofs/artist/a425131a-d67e-442a-a613-e7555f133d2e.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 0x574ddc6986d0ecc006942f92a833794bd4c6dd388650593cecf995fbb924558d. 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/FR26V1628344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6989a46f71013acd48b7e6517170904350eaa314a70ee91dd508b551182def57. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/FR26V1628346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79aab427ce2351f5974afa4d45670c05526ad3e418e54872c2bcfc7e8c4438f0. 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/TCAEB1975934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b7626da0f33ef439816a8468ff5b1e8f9c916bcda0d5f395cb83cc373a77776. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/TCAEB1975938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ab2a96f734c3a8804da5e547e0f679f0cfa815f8825cfe6830eef6cebbc6090. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/TCAEB1975942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde94f27a3692c80fe1f09371bbdb32b8a2512e9d14a153241cd19bf5c8b8d070. 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/TCAEB1975947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe31d7902872c86d62bcd4b60b4f37f273e6e83cf91752f374c34604bf6a203ab. 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/TCAEB1975952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x836c3334ed0190242dc63a16a2aef1802ba5903315c3b9b8876596f088b42369. 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/TCAEB1975953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x046cdb0cb9700f2b1efa19aaf7d88794ad501b1ef0eab39119c63cdcdfed5b1b. 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/TCAER2081977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d6e03f582f23016181ce6487ffef853a1f1092bd9e79485dc512f5fff94974. 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/FR9W12242458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7d6872e8d934cd2416fd454ab7c9f9599e9706a5fa4d0f518b91135e1cfb74e. Chain 2 (Bitcoin): anchored in block 958498 (2026-07-18T04:54:58Z), 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/FR9W12447156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd277b92b72cbbced2886524f508153e5d1e90e7e936f6694d47d66d9f20f1970. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/FR9W12447154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x215cdd68e429b7c419a5f147800395db0d8b642445ad2885ceafe5637412e786. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/FR9W12458554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9cff2c0cffd6009cccc75651445d5274472fe17074bf6fac7a5a30de2833ce5. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FR9W12462906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6d48e324b4587fbbcb04fd51e1b23c07c582f90de86aa0c51ab89502869627f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FR9W12447153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x215cdd68e429b7c419a5f147800395db0d8b642445ad2885ceafe5637412e786. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/FR9W12458554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e3a7369c2d09d153e038ffd7a0f8d20211ecbbea5626fa70545c1dd5792787d. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/FR9W12462907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedaa3f37ddbdb8edddd83bf1e2e16177aa1323d029e0aebc59e23129a0b5208b. Chain 2 (Bitcoin): anchored in block 958971 (2026-07-21T05:04:56Z), 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/FR9W12461220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1c2d21a067c9816c50933a13ca7f5616425dcd4a82870c806a5325a58522e85. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/FR9W12462909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xead5eb36941caf4527ba54cc1ae5dc2a1c6155c2c7e20e5d74d096042924b3b0. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/FR9W12462910.