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 0x6763948936b9beaaaa32162834d0b878d6878d98a8602c0dbbc2bff6d83f3716. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eb840c7d-7e55-4c7e-a5f3-901f455df74c.json and https://artists.proofprofile.net/proofs/artist/eb840c7d-7e55-4c7e-a5f3-901f455df74c.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 0x3a6e7faa3085ad420bb61fb5cdc8a4dee0c1e3bb03f4cedbbf5b0f5bd0795583. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/RSA141318429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd918bfe1ca166a4ee331690a4facad899e8188d2be80548609af34469d3b74f9. 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/RSA141318431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x640e8b4ea2b7258a8b5568dbfb8f79fcc6d9b0afebc5603af9fd6175cd9ff0d7. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/RSA141318432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e285ae805f0dfd24e0e001f78bf17ed30f6c0e9d8b654ea236a32ff7c66cb6a. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/RSA141318433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ed6622129c4eb6fc21ce262fdf674cb3c23de9390cbd6c6c8a17cb785fec415. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/RSA141318435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf758bf08b1e963a41066d96d4b53a2feedae35b9b5460917ce02d41fd29de359. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/RSA141318438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71dd5b329fd6e5be09528737da95d5daab301103496cf043dc811c916ec4ebc6. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/RSA141318616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba6e6d5fb61e6063056a0eeb748373a0579165b0c9a221e69e1953ba7a59bc7c. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/RSA141318618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x529e4626e3e21202d3b313c571375adbbdf36e5e7b0f98066e16a0f6a5d2fc56. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/RSA141318621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x522562a965b2a828e1c48220ee1ce36c5f5a0f7b66ab1d09e45c29ec8b75fd92. 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/RSA141318628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90f0404d3915b4674305887b3ae4f3cc64dd393c95a490c52dc40d2c3b62091e. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/RSA141318632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf34131fa8008b496846401cbe333f8f0977461158fdc4361a500d0ea61cd5a3a. 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/RSA141318439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x195821f644dd557c6ce80c86519be2ef3a9d5bb96b4c99407d5db7b176e63be8. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/RSA141318441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f9799e3f53712ef9e62101db0cda9dd7ce6ec9ef9d03de4231131f76341ba7. 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/RSA141319329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd9886f7772cd653916adee847a95ad5394b60e05ccc178ba9c53d8cb1dfdfb0. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/RSA221701351.