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 0xb411a8727786f2d03d83abded24eaeea3c67595d4525967dbab52cf4467f4518. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/82f4b2cf-fe50-4a32-b022-9cd8cb30aebb.json and https://artists.proofprofile.net/proofs/artist/82f4b2cf-fe50-4a32-b022-9cd8cb30aebb.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 0xf4f459b4a4a7159c6c2d22694e8cb4ee8b010b52ca51d6d456e6665bb7b4456f. 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/TCAFB2015652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c530c0d5329ef175773596f27aecd93cf0a5d459023f79b5afb48feae3f2f1a. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/TCACR1653142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfef33a2ae581e1c62f936fd462ee751d9d8d53255a489bf2c14c4c1f86401750. 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/TCACR1653243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eeba65d4eacdad084cce3cbaff55c9d7e9d531cddc25047800e04aef56a236e. 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/TCACR1653252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b2c7dbefd1ad979d78d71c95e098f8533b0b0dc9975c90b8d691998549b0cfd. 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/TCACR1653287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e365c3b33672a099df8022c7a45d2568b1dedaef023365d1ad1f7f8dd3151c1. 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/TCACR1653433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x221eb5ba8d06c43cba562868345df4e43d94d3661ce4fb50d0d6be377a2bc2fa. 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/TCACR1653549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa32caacd08039ba9e2c83f5f3e0534e3ffb1bdc7ccbe0bc8b6cd4e0ebbec6699. 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/TCACR1653550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87f7f2e871da36af7e067e5f0ee398ccc2756e0d7a54e5e6f85b0f851479cf43. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/TCACR1653551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x244cda2a1efc0810fbda6d63e656b1cad0fca4c3a2900fe409d1c3141db29790. 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/TCACR1653561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6d512ced171ee7012a2bceaed1687afca23724720d18f31348786cd27d82455. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/TCACR1653926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x930f0305612ff0636f9013cc4b15b4afe4a8a739e8eb7e255e139175c82ed6fe. 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/TCACR1653942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeccb07428879c51760b45648eb76dff7ea323dbed349046228b2117f412154e8. 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/TCACR1654180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c645e96eec3a4335d31774b136ccef3a9ce95d6d8b4df9aef8ffee65bd9aa29. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/TCACR1654181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7443fdd6710488777fbc58a8d7255c8540ac58e1bcc73da61e05ba39c8246f3. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/TCACR1654513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23310fe8dcf04579551361a9bad27920d3035fd080b8d5ee58fade9c11faaad1. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/TCACR1654517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcefbf5c9673a7a8542b18e53ca03b6ab442641a51a4801ef0daa17cb2780761f. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/USLZJ2453086.