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 0x48c9ad2e3f5f933bcb84e5278de6291ed88e4dc08ad11b422af621826574effd. 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/fc4c106a-3afc-4c9b-bb10-1451cd2a6889.json and https://artists.proofprofile.net/proofs/artist/fc4c106a-3afc-4c9b-bb10-1451cd2a6889.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 0x44b300ba8e23c91b9972533d9a0fd894c7567bbc8eb756df19c168ce1bfbf1e5. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/UK9AV2101867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc06e2eac756616ec32b3732a034645f898b52f7317b2e2e93c843bd2ed86eaf. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/UK9AV2200027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb657d3a838e247a82c30e04487aefcb0ad5e78c068374c8bdbc17b5494a11bd7. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/UK9AV2201039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc06e2eac756616ec32b3732a034645f898b52f7317b2e2e93c843bd2ed86eaf. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/UK9AV2200027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44b300ba8e23c91b9972533d9a0fd894c7567bbc8eb756df19c168ce1bfbf1e5. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/UK9AV2101867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06b5ffd159a26a9b20d17884b4e1c07790fac3dac1fba1b4b78353a5dba5b6dd. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/UK9AV2200708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fe110301a5ee359c5dc27466e8dfbcbd1af1591ec46243ce421b997877626af. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/UK9AV2201040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x668c62b2ce6b0fdece2fe19caf669266ccd0b8eeeabd6f79c71c699b87b25ff3. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/AUI442300098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eb4abab4bc1c04a32a5a751125b5abb4f004467150bceb3382569c87a582750. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/AUI442300099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb09f5952e7c2aac1ffe1d3baa740422e0355e27bea5b6b69c3ebb321859489b8. 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/AUI442400225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aeebf3579340659aa8b6eb100cdacc2a8cd2e6391266776d3492d8bc97bdb00. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/AUI442400130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5f41c027828fa01272a70679cf5979fbc1c1f45fd94ac77908f218e19000a1b. 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/AUI442400255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb09f5952e7c2aac1ffe1d3baa740422e0355e27bea5b6b69c3ebb321859489b8. 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/AUI442400225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aeebf3579340659aa8b6eb100cdacc2a8cd2e6391266776d3492d8bc97bdb00. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/AUI442400130.