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 0xb0c267e9d43ecf894ce68ac8954e107f266d1d89609bb27d4bf929681227efa8. 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/39229fd4-c8a1-470d-9cc2-eeec65a6aba0.json and https://artists.proofprofile.net/proofs/artist/39229fd4-c8a1-470d-9cc2-eeec65a6aba0.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 0x5e88692241f92c16159954ed5ca032ce27b67b0e14db8ddae8fa7ebe9296d583. 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/BR7PR1000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76a11e03e2a606c61fb036758467fb9f54b7d71f128c724a5eb6e203a4cddde6. 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/BR7PR1000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99cc29df2f4329847b6d950021c029b2e3b8be1eaacc6c5145a157a1952fd498. 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/BR7PR1000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f14d91bf9ec3e824c3a8f04420178c1755bd7e75c9198f2d662c76d011e7ce2. 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/BR7PR1000013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf84b23702c68bf9b91f150ef1daf2e56968aca912115c7b8ead524d3661141da. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BR7PR1000011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c8f7e65b18e0fa887f99f801034f7007dbaa4434b92f9808fa6ce871152f270. 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/BR7PR1000014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83af1335f377e563516b2bfa5da8a0de2e682c041216f19903817a78dbdee762. 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/BR7PR1000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32b05af01a28cfc56332530ec51222f9970bc0eb8b34e2f136bc6461adb6a568. 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/BR7PR1000012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90c24bb1b8515f76ad2650451d061981dde24a123f82ad873fc5e532d4442abe. 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/BR7PR1000009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dcfe4fc6e819f2c5bc4ceac9f44415386b846640430028b8e21123249ec0934. 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/BR7PR1000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43189a5da2ec60905fd5ab91e309d3e9924f31f7ad240ce480be34d1b8dbbb39. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BR7PR1000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb560d0f5796e97b24535e2b3891ae965d59716c0ddb2bb923d967758ffaf06f2. 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/BR7PR1000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaeb090e627789a5ab1f1e11739f51d3bd47dca6230045a99f989e981a0daefa. 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/BR7PR1000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd00add8e3ed20d2191b4743f987e88730dc69d02b89d46c7fd0106d565b93cf1. 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/BR7PR1000008.