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 0xc2447f8026894792b812929e196ab27595b2bc1df6965716d466287ae467385b. Chain 2 (Bitcoin): anchored in block 953719 (2026-06-15T01:07:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/88ff160b-91c3-4e58-99ce-6e3a725ca0bc.json and https://artists.proofprofile.net/proofs/artist/88ff160b-91c3-4e58-99ce-6e3a725ca0bc.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 0x7f9585037e5d5166c62280f20152a11fd61a887d347e163cb14f47494c122529. 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/ITG271600266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf17a5af2df80f50dfcdfc740a6bbba30763bd503ab4f5053d4a48f6b12cf684d. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/ITG271600268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b0394afa43eec967a2f7199255b6383b1e679de4f64a4739d56261d2b3424cf. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/ITG271600275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd67ed7c959bcfbbc6ec5d7062d4775c7d5a88326e5412e7d7cb9f5a002529ea2. 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/ITG271900840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2757dae79cbfa9c7aa4614bf0a0789de105f27e596a98bbf50cb4c0ef7072ef. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/ITG271900841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bb21616ffbb6d139c89f427334e3f4d45d38590a2b9ed44c9ca69a156e55974. 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/ITG271900842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65c3938370f68f9d47f24b4d0692973ed55c84facaba431f36fee4495e84d360. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/ITG271900844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f304e454cc44bd5e7241e5f286a886fc70876e140866e297382186bfb4e061b. 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/ITG271900846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x688dff7d296694884c2d67f01b02f020feb9203c2c1eac63680aeeee6a60bf09. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/ITG272300594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04cf896f8c1f4fdb510f99b884cdd43ebb136167ef973daa8e8acd9ee4fd1514. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/ITG272300595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d5b85bab7bb748be2e0f3b59bc94ecedf1e43deb843b95f34c3b04e227d425c. 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/ITG272300596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9deeca607baae6923ca9ca991dcc8dd26bbf0da27fca0fbb226dcc9da0243697. 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/ITG272300597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf02e6bef08a8361cdc6a9c7f06a758292d1c7b85a6840af66ac7de326a17a63c. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/ITG272300598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb8ddcbf9378d8f2cf5aba2e89136cbbe4ffcc24cc17a9f7d78b98e7ce33adeb. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/ITG272300601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac43ffe249f5d5e4afaa7c0c7b7e0ea08c1c08aa557b62d846b2a79807183f72. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/ITG272300602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a6cc24b7778ff758fb06f77c5643f30cbf5e58fff25a9c68f75e8225e0c7dcb. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/ITG272300603.