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 0xd53bedafe8315127bf2ca41f5d4eafa64d1726dc57abeaf5886913382bb6acc9. Chain 2 (Bitcoin): anchored in block 954650 (2026-06-21T04:51:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d8d4f89c-a82c-4f4a-be09-d860498b7a47.json and https://artists.proofprofile.net/proofs/artist/d8d4f89c-a82c-4f4a-be09-d860498b7a47.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 0xc28185c831eca32e1d8c65e975a4f66bf016edfdca9d7345e6aa5cd1339afa6a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CNZ512200315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bf92aadf32b38bd76a1c0e3d00a83aad1a52be81f8f6558738a050c6c6cd9b1. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/QZZ972340338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ab215055e57b1b25d50844f9cc4deb8d87f6db29b6751dfd314406fd77ebbea. 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/HKG731674006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29b5c2f2e759c251b0bc6e9963dda263a8e127097ab32ffb5e62c30c4eed2e47. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/HKG731674007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59b2a5b31c3a3fda9cf2fa09f76702704af1bc9658f05311cd99823235350b3e. 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/HKG731674008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f975cb42d5f9471f8d3e76b62ca30511c72e1eafd3a513dcc9213ecf5945abb. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/HKG731674009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc2cb6bdb341ba9c1ef2f4dd028686a87e275984f548bf0720be95fa5187bd10. 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/HKG731674010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4bd40802116d4fd17b7c6b7d80db2c2bd8b24473661b6d1d93a80b552afe64a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/HKG731674011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d684c724d8bd040ffefd0533314b85dd272068fc6452fbed0fc32303bf128a2. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/HKG731674012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefde3989b1e679ea1924e0637a0a5f88d35f3ce1b5bdd372aad992c50ef55916. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/HKG731674013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0feb0c2b33d7040da8f214b75b2cd9cf791956a5a9886b6c86f4df57b03bbde0. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/HKG731674014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x122802dccc08298e22398214332a2427c1f212a19f2a9cff3759b5dabe374b9d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/HKG731674015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a07a7d90c1c97a55e400ef65f736e062310ac6f99744ddf566f8f5281253d5c. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/HKG731674016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbd6dde36d8955fb94eaac2fa994fc496bbd4456844c14d1aeda8b11e0ac94fa. 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/CNZ172200047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67690a8f4382d1a4df10a244e322b25598f55a7d0e25beb98d7710df2ceaff8b. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/HKG731721723.