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 0x8e76e0d3213eb75e94851d950b2b5e170e07dfc40898a7d586e1581544cfbac4. 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/8c08d743-7d2b-4d87-ab1f-0f5336c1b5d5.json and https://artists.proofprofile.net/proofs/artist/8c08d743-7d2b-4d87-ab1f-0f5336c1b5d5.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 0x00c6e25bc6cacce6c449d3274fb90901f446b75a36f63757919b1312d47c537a. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T21:04:49Z), 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/USUYG1524365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe681ea1949276170882ec5c65b71bb186bf0e4427312dc532d39baa9dff7c498. 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/USUYG1524367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaadc740498aa69084c4374e8dae6824e2952de3b58aa988a089714f0f291f46. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USUYG1446143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3035177d831c13661b1dbd5de20797a60d8b79790fe8bf4b09a73273cf5c6dc7. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/USUYG1446144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x626d88199993237d1dfd738aadca3d2040d3b3fe9a52e721f6be45d0540175a8. 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/USUYG1423010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec05a82fe89f96c353eee3c12e18257e37994b67b6a33668248cd0c60b9d79d1. 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/USUYG1389301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd50ec34e0523d24526643607d6ec8c443ce110387d120162e5d170651a61ae5. 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/USUYG1402858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4f05eba24ca313999aa44c697e910390ff287720754b44e7b632d310e31d4cd. 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/USLD91718251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f56bd350f41747560c303eb46c2af964a781899b15d5d797b131e711108a3bf. 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/USLD91718256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7255dff0ac6f70f724920db986d8677b046d2d2c2d5bea03a82062340305b3f1. 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/QZK6L2355028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5608d878f27a82afac72fa8c0b2cda6f6a0158386f684323a97a5f5c93ad39ce. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USUYG1427769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x626d88199993237d1dfd738aadca3d2040d3b3fe9a52e721f6be45d0540175a8. 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/USUYG1423010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd50ec34e0523d24526643607d6ec8c443ce110387d120162e5d170651a61ae5. 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/USUYG1402858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec05a82fe89f96c353eee3c12e18257e37994b67b6a33668248cd0c60b9d79d1. 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/USUYG1389301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f56bd350f41747560c303eb46c2af964a781899b15d5d797b131e711108a3bf. 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/USLD91718256.