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 0x431f775940eed815073f63cfb6b9044061aaeb035eeb9b370b3d71b059b0a6f2. 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/f9eadc9f-f635-4e67-b00c-69ba46405e36.json and https://artists.proofprofile.net/proofs/artist/f9eadc9f-f635-4e67-b00c-69ba46405e36.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 0x13c60815c54a08799abc714b66370bf5c2adc06baf3b71e20fe7432c6bb2c185. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZK6Q2198006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69908e6dbb5f7e77e743b6c7cd338c3257321ab8efdc306f9f01a84ab163d17c. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZHN52245840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3a4bba32278d51e3cde5f4ba1aa2f54d9bd400e2f5952531b597a55ce0ff1dc. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZES52161244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1334012dec410d8f36f7111f83771bd5d0c738d26b8a4024f01cc261e377824d. 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/USA2P2334881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13c60815c54a08799abc714b66370bf5c2adc06baf3b71e20fe7432c6bb2c185. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZK6Q2198006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52268b3e3df7268ad04dbc1cb8d9d3ea86d6f70bb88bb35e865815a47bfae069. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USA2P2337010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddab415ddb062fd9d65a797a7d2b431cfbf60738c71a646c030a3afd45124bd6. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/USA2P2337011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77d0d6fcf9792a840bf7c6967474983f69cb28d2cba3da8d0ccd740331a62797. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USA2P2419998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3a4bba32278d51e3cde5f4ba1aa2f54d9bd400e2f5952531b597a55ce0ff1dc. 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/QZES52161244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe047522ca86f1edb98ee6790b4d8438535175abb89c67fd49585ee726b24c967. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USA2P2450879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x889ff5df9a684bbb3d4b4632ff02c7f87901c78fd1d9afa7299a77a326dce35b. 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/USA2P2450882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc488fbf79ea9fa9c4442ef7eb00a44f1a59f574f6b24ed3c67a7b19b3eb33c33. 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/QM24S2205427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc488fbf79ea9fa9c4442ef7eb00a44f1a59f574f6b24ed3c67a7b19b3eb33c33. 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/QM24S2205427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26179e071604a05c944f55b8727d00574dbafe69e242515a7e9ab55ee47481b4. 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/FRIDO2412480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26179e071604a05c944f55b8727d00574dbafe69e242515a7e9ab55ee47481b4. 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/FRIDO2412480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26179e071604a05c944f55b8727d00574dbafe69e242515a7e9ab55ee47481b4. 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/FRIDO2412480.