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 0xa06e1cd9d54481027eef98b4302171dbd622250f2beed61544a7ac159138128b. 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/54d2d294-2353-4e25-853e-3af355633e14.json and https://artists.proofprofile.net/proofs/artist/54d2d294-2353-4e25-853e-3af355633e14.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 0x47893f3a64139e7e6f07f593d78211a523bced41023c7d4868488a8f5b874f52. Chain 2 (Bitcoin): anchored in block 956425 (2026-07-03T01:28:11Z), 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/QZHN51948292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x694c53cb30d892692cd81fbf049bd5afd5de099b100abb0eb34f7d305818c460. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/QZHNB1940435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb242788c275badda57b3d8288fc6eac9058b2a9b27b68e459e9fe55062f56642. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QZHNB1940436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d293dc679798443c00e7fb424df9f87d52d9ed6dd193be6e4d5d07e8360a489. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZHNB1940438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4cf94aa747784a1f3bffcc8f4b4ccd9c1087b317fdaf32b4a32cff1d516ce8c. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZES62192349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0df3632419fbe6b459a10c1281eafe60ad000e2236174ed840ef09f21507bb68. 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/QZHNC2195584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a75067922f21e7d9ac8a850642d625f2645f0ff65756615da65db0101de2faf. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZRP42113109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6fd875fa6f0772a22c0c9cc6779eb45fdfae9f2ea3559747ef52321fc8a7cbf. Chain 2 (Bitcoin): anchored in block 956425 (2026-07-03T01:28:11Z), 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/QZNWU2255655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21e47d4a670dce73c835b0740b6fd028bc6abc95569125a51e628689290edaa7. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZNWU2255656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e434c78038ab68b600f02bde37c58e86189e410a1c35ffcdbe829bb025fb605. 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/QZNWU2255657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b503140d117f1b178f960705726e748d086fd9b671a59bbaecd7dbc10742fcb. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZNWU2255658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc0945fc2eef46a4cebf8860c070353f7f598a212d7d86720ca29279f0a5402e. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZNWU2255659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2c7e000fe288d1661c31b4c7f470391207474df62be352fac377d05172a9299. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZNWU2255660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2f5167aff4ef072af74f0e03470e81aefc4c36360ee5275fe3f30b2d31d8406. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/QZNWU2255661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d8510b80c97944160a2a003df26cb8849775c94145a9905d1e0ed9b681d043a. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZNWU2255663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ca100d5717b80c71ccf5adccd0e72af4fd7ddb652f3df10d16e2765eca8c463. 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/AUI442500115.