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 0x0934cc2383d72ec49c4c1decdf6d6e38df7c0a1cc0154599285ee4a299d37de4. 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/513f8f04-f644-44fb-a6ac-3162220f63b8.json and https://artists.proofprofile.net/proofs/artist/513f8f04-f644-44fb-a6ac-3162220f63b8.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 0xc1195faacf3510e020d3ee6c3a7ccb335b355085d8b728706c35d23beb503840. 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/QZDA62033580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe59e86d6faa3c7d67de71e430d3cfc7cecaa527e981b907a8e68a6bfdd22c047. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/QZDA62033583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf51c119b736b9b67adddabc4968eac1a1eca2d6cafa4fca7e19e569a9543af58. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZDA62033584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x984ad5f3166f8a55b6b923ad475de1b694de628ab6cd5afcec17ae9f06636ad4. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/QZDA62033589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95ff8ff3b8f4ad967e2267ad14da51890b50962e5980bb4e2184e7d57ea3046e. 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/QZDA62033590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x191780197e8bcd3bb73852ef6ecbaf1aff06e3bdb37b90b54a7232523c264af2. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/TCABN1385204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92e47559afaa4b3f0ba06593226684e03b9702537b706b2bd162f08e5dff8292. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/TCABN1385013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f8857d35a6e139de9591f4a0a30574947585a18b362623bcc8db159b5e1777f. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/TCACF1571481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67657ef0bd629bb37aa1b9f991db5f757bd1a47cb7bbdc680df654a0e0656127. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/TCACF1571549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29fde0ef6d94daf558fc64bdfeaa0ea5ccd93aa2628350fb14e12aaaa6ebbe04. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/TCACF1520425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x927015030111a4da2822ed711fc5191f4bfa206fecd4300c2bd9ab4a7ae250d3. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TCACF1520432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16286a2c45cc7c35475a79a8ca9242c70e1ebe38ecba2e5fbd901e66f5555789. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/TCADD1796698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf44505b18b6ee7f3841a31d74d449e5d21bc858b78f7f519c019e40e094dbd6b. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCADD1796701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04148ca8ddc97e4b2689f8388a82490b9da9afc5827f024aec126c95cd43a1ec. 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/TCADD1796704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86932774671f7fbc6c187db691fc110761e437be1aa23d534528f7fa7e4f0f7b. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/QZHN62022610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5215d47da6819683d1d65baa5e72c04f86583cf06640550ddb774592ae67838. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZHN62022611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ae715e817ca7e8f344256c908c106cdf64ae90e62315fd0b39af849049269d9. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QZWFF2500865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x994fae5296690ef33a9100733e4c37b5f1113064b03f91f160617ec9aa5eca77. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/QZWFF2500866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd825f4f8e0d2e1a31f35ec91fe5a46a76362891661d3e25887eb673bf472b376. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZWFF2500867.