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 0x406cf18837743f4ceaf522c0b2d5fd2320ec418cba0c48bd4153da52ebad331e. 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/de6daad8-d275-4fb4-8ba1-faffab9b18c4.json and https://artists.proofprofile.net/proofs/artist/de6daad8-d275-4fb4-8ba1-faffab9b18c4.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 0x1e4f44ff4ba035756203196168a0dc03567b72b34f5b7bd7758c625e353dab65. 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/TWB870106707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe07a6c9285a2cd3aec494eb005127cddfa9d35cc6b638a2b966a3e82aa0b5cd8. 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/TWB719601101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x069409ab72426fce7f004593c4674b2cd04df4c10c91fa029a6b70f4dd6ebadc. 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/CNZ501700193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4a7251a088071bf3370dcafa7f2aeee38b88315985dad8df2246cb96df66958. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:53:20Z), 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/CNA651301401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x507a7e671e4154ea75b63fc52bae9e7cd4e8d199b85b50d9b97968bca0f23f9d. 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/CNA651301395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11f4c7bfe91a8c6a63b52b1b9fda28f825d9917f78ee785a22002191c4086e3c. 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/TWB879231302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x583d2b9de83d7fb37071ef7c67d68c32963cf264e2d4a533d94b17e2c74008f9. 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/TWB879231303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86a2d41b0afe7708b51fd9c29c0a05acf9d349a4f05a23af3bf934ed16b5c7ce. 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/TWB879231304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x384c6b893cbf22dc3c5773497faeac3ef5252897507f45476e2bc627208f9a82. 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/TWB879231307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42f451e297e7b7437ae4bc67cefc88e5baa521edde23e77e78514f431f846540. 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/TWB879231308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c948145df85bb4dc369fea75e9bdcca763be8825ab7b83187ae1f9c5bcd8f6b. 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/TWB879231309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40580da55baef10b81932226939bacbce05498e0e08b6ce82c4969cbfc409f84. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/CNZ642300173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67496d78dbce9b77f1d8fe184818c171bb0da867700e3ec6673abc542dcafba3. 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/CNZ852204322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13eb1ce7092f5a9e758e00d5a7796abdb5eb7b87dc01efa978afcb457ccb8ec4. 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/CNZ852204327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc59fc112741700529dd912a515d355878924c8211cda157f0b23f047798fb8b1. 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/CNZ852204323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68633a5ddf5292b81ca74daabb0fac21a87c2d0eaa3d30d9b3d669ea78e531f2. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/CNZ852204324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7afefd63193d76fe422590e6b5537a51a3e45e8835e71c6b03d8cd1ebc1c5b0. 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/TWC179200906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdff38d776908e8dfc1bb392d388a040908d84caf78f5d1c7bb5b309805ccb20a. 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/CNZ642500016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbffe6a117051913ce1a3435ce0309f02ac765ad3098bf965f8e07db9ceadef78. 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/CNZ642400333.