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 0x4f7af8d4f6315ae389899fa91e74aa36b59bef67a2707899c8d0ef7adabd9f36. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ce1b0138-56b8-46c4-a196-29068b67bf7b.json and https://artists.proofprofile.net/proofs/artist/ce1b0138-56b8-46c4-a196-29068b67bf7b.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 0x724fd8e77445ce1dc33bde1d5686908bd74bf2be0d0f3143e807d3cd22f0fc67. 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/IL1011120934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4cbb70c5de5f316f5e18f409ea98f3185cc9db9f26753aca25c1e73231a6e6d. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/IL1010900024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54fcae0638b7bb77ef60b055d4f8b2eaf46eb628b9bcb12cd7691aa74609e027. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/IL1011120935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x035e73a518058e71f67d0694816698ac40439ca360a0cbdf8d3c131558be3c67. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/IL1011120936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddc3539a4c4c0020ae5e23963bea1c56d8c106b2d05c78faddc96d6a68669fe5. 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/IL1010900242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98fbd2a2b15db6ca442075c5f971e03c786ac2b4033e0aeda4b53e64250c702c. 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/IL1010004977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8653f336e94ddb86cb64a50f8d661ff1905ea950c6684da2561577b3d1bce74e. 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/IL1010100587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fd2adb866c3f523c5c0d65daa5dc55f6b9e90debe734c7c10206da8c9a5b18b. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/IL1010100588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe940a49647494404ed5719c060da240ea4b58be15781b7b1d868f0c036292ebc. 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/IL1010003068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc63482ee1f20817d97df82a2b25fffba9f61893342e74c0b16518b2c4d9eebaa. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/IL1011098092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcac7f5309039454883edd54f93313c3d33de24a39ceb5eefc6ef185ca84b465b. 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/IL1010000446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a6d0f637ddef9980fb84df49dbaa00d8e81686439d006945b85c0b3b726a5f5. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/IL1010004678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x270c914f8e27c8f29149455c47707eb69310f339a9dbb836668c00f6d9024578. 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/IL1010005158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x766343f157220d19f0648eb9bd8f5bf8d915376b1984abca2fe5bac48082a9a1. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/IL1010005899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98fbd2a2b15db6ca442075c5f971e03c786ac2b4033e0aeda4b53e64250c702c. 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/IL1010004977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8653f336e94ddb86cb64a50f8d661ff1905ea950c6684da2561577b3d1bce74e. 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/IL1010100587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23a6a4c00372c11b723dcc13c0f8fb8bae176c48a55c3b74f1173f025d772648. 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/IL1010004014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34275cfd5ea927a552115c2f323ba541329194490072c4212d574574225c0a42. 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/IL1010000384.