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 0xee4bf6cfa506de85c4c6a653107780c8d0b80ae36048f8f9a3bc551ec4d1ee2e. 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/282cbdfa-c3a6-4dc0-a542-a6ad092ae426.json and https://artists.proofprofile.net/proofs/artist/282cbdfa-c3a6-4dc0-a542-a6ad092ae426.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 0xf19560b84cb6295f2e573807d40747ba58bbfda8c841a053034ab4afa97fd3cb. 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/UST8K1823658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e7424cb0e8e7ce9871f6a4a1477b20e9c90534ee31348d8e58efa70c45adc63. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCAEE1904510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3577ab434c7307855e31f2c705466c7344a3d5a8c0f6210dc46b5d919c9c98e1. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZFYZ2073850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb691a8d7bde3c267fa33cd54468da8bb486a232494d90a29a5dc779a8055cd05. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/CA5KR2195268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7178249ebbe7082ae923e5b7af969f85a683bb5c887b1fd9e1217d9f63418b0c. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/CA5KR2195269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8213eeffcab94b681ae63d6a15cfa3f316fcc759f22cec318c06c1d308d446ac. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/CA5KR2195271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f880a24f0ec9ed1c6bf3282d670eefdb4832b01cc8520e6ee54baf13d63ae83. 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/CA5KR2198466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54ee913ae07a9e219122e7efb93cf1639e3e0e5612ce1ac77bcb1f8b8f9406c4. 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/CA5KR2198467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8aa4e949d45d4aff77464f2f358026aea817b03814ec9bbf02bfa358e4bb74f. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/CA5KR2198468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05480cfda56bc79a20037f7ebad99c15dc2e2769af481e946bbf5d667a04a4a9. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZDA42306484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa986848a1f07cb6dfefd256c4c9d5b27d741f415cf5116ca5d06db33d31f1caa. 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/CA5KR2211463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7178249ebbe7082ae923e5b7af969f85a683bb5c887b1fd9e1217d9f63418b0c. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/CA5KR2195269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7178249ebbe7082ae923e5b7af969f85a683bb5c887b1fd9e1217d9f63418b0c. 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/CA5KR2195269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0409a6780c9f9555a4fa5b5e766278c6cd16f135c2148cb0f3dee387e5cfe5c. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/CA5KR2017210.