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 0x9ffe496868bdef9e42f069c420280ca02c6d3624e08071acd41ea12fdb75bad8. 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/7e05b70c-9167-4dc1-984a-dca2cd2ba6e4.json and https://artists.proofprofile.net/proofs/artist/7e05b70c-9167-4dc1-984a-dca2cd2ba6e4.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 0x16c9f11e7b9b16c102fb57604db64c0de76de4473ba1bca67e5039f5ac061733. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/MX3741300269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d5348973e75339cc30ff1726a41dc88f73aad561ff28704b3415a0b4d7b157b. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/MX3741500194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x026526187f9b94c7e75df706bcb335e6b45cc62147136f461c57ca8a232baf95. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/MX3741500195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bf9cf3a080b46a9a321b47c166abdfa4115706fbcb4c4b619eee186cd3c3ff1. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/MX3741500197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ad703558ecd28e636b1a4637d3331cedeef3240940605e5a8655f4d03490b5f. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/MX3741500108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3725d859cb7bb97b6190ff351030953cd9a40e122a63f7739b71f5d9eb9c9c5a. Chain 2 (Bitcoin): anchored in block 957591 (2026-07-11T17:21:30Z), 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/MX3741500198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99d94cbd99d22920ef5c616cf6429cd2227f595626f839030a7aa99c518311f2. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/MX3741500199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e92f89dd956a1cc3cf2aea9693500be8bf70a3234a25330affe6fed99180b6f. 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/MX3741300270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18f03984c9ba63fa29c5cd409dd720783cf26f0c3eced4bc2977a5fe4b8c7de7. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/USHM21975223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca15dca9667f7bfd206772e2087bff9af0268f12c39f6fbf6f412c51a5f858be. Chain 2 (Bitcoin): anchored in block 957595 (2026-07-11T18:26:17Z), 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/MXD782203703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf88a920bbae16e33380b66e9bbf9362e8b73a294d94e1d4154b590fc2b5cdf34. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USDY42286675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f88cd5964d1c7cc8f9baa786e658d4fbe57fac8671ff513934f40d67e44ac44. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USL4Q2102733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce38ccb14830c11a469c56683ed8c6dd9114a3dead82b9e7c1b02a6bba3f5189. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/MXD782402173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54d9484d211165982b22973408db5d8a7edfc3ea58612985867fd8e3f16d7d15. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QMBZ92596146.