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 0xbf1fe032b80e131b6b1f657bea10624f164ff8bf083a5db927d977b7c7c23762. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eabb4b40-857c-42b3-a0a6-38735c65a247.json and https://artists.proofprofile.net/proofs/artist/eabb4b40-857c-42b3-a0a6-38735c65a247.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 0xae260260b50314ebdd7f9cc34db8164d581b77dfd7262389eb0c7b2c06bbfeaa. 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/QZWFK2589910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefeda2f86846751ac6db9aa897931a899bed452776364cd7f864a94ab86d2c70. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZWFP2597293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc299f272a7e07b4ca6f6e95b1db829ae17758c5d0d76d54829b5d9244b2a69fc. 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/QZWFP2597294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2687f9160831483eebbe6698ed0f79970472de96645a96b632b66155dcc7c5ba. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZWFP2597295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34997efc72e6d4e340b284540748c9a20a393366e8ab49bec7fd969b78cc39c7. 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/QZWFP2597296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01cb6b82e52880d41e5752f2c0adedee104a8a2a8b3628e2f45bf46307c25677. 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/QZWFP2597298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fb4013743afe3ce3847a25f999c170f87d8898d03894c789245e8c1fabcdccf. 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/QZWFP2597299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7db8484fd6de3a367af40af10429ced578de17a664016de18d2e256e18fd3497. 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/QZWFP2597302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe122b8bd4267f2b68058de6c9c2e164aecb3d8881c2b30efbddf37be32b5d382. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZWFP2597303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4457d12248cd4aa7fa8ab4965c46bc6512e078c016ac888001d2a2daef20e1f. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZWFW2536089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9dce86f9273da4944ba994b4f51664b7779f0c7e6ddb243eda056fda6c56143. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZZ782534097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6f69effc76b45b3a35241b34eabfe7a2455aab3cbc34afd0cfc592ac6a51b29. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZZ7S2545783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7feaeb38731807d85778271e542b6d85636886c005f8bdaa433fd30ca1dde948. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZZ7S2545784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d4816d65caa375efb123d65eb4fd99c142dce854914a7ddfd490ef2a9495592. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZZ7S2545785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3ef1d7bb0574b2e837f98ef1378b30d27cce94a9e1bb816af105d984c56e589. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/QT3FB2548306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c45a535a553ddefad4b1637d8b652d5ed0770f4b3c9eaf954697fc6ec6e4371. 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/QT6E92574594.