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 0x4126e421a683c000c06d885ff9d1d7de4aafec12c11748a400d649df2bd0a044. 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/ee43136a-b592-47ba-91d1-2609848e56fa.json and https://artists.proofprofile.net/proofs/artist/ee43136a-b592-47ba-91d1-2609848e56fa.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 0xa6e35d966138d553b650a780d5455176672a9f7be994b2d407cbd5dac7dcf3f0. 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/QM3DF2290714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4350f56d3e2cf605b7856416021d2b291896b043920661196a097f0cb113495f. 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/QMANG2202600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x160c7dea231586635f58729bdced9efdba017e01bb8f75fe5e096298760c37da. 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/QMANG2218699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ce3a59039efe41d2b3a92b76012f9efdbfdf79a4e008350dfb5fc3798634a9d. 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/QMANG2209757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf79f14a031b28e177659ff27a7916b519c037fb6c6c72841ea837bf4f8f14ad4. 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/QMANG2232781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0741c709adf36adcd6f55332ddcedd08c23b69d1da3a3672cd4371cae3d87b1. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QMANG2236428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68d93f4ba344b36d49b9a50e17bff4744704bb1b7ca7f7ebc0880e9ec308a004. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/US3DF2411078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b151027f0f7fe8e991afc74cdb3f24d26fec7245f2187f0e0c1af7938f3fcd9. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QMANG2489054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7a7b5fbe7266f9c9cf475741555a84e1edd3320d102654b226ce985ac96f799. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/US3DF2425259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20e28e2c276bfebed70eb985b36ba66a6ac8c4b0e0892ef56b144f3802ad6414. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/US3DF2425255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43c41dcc0b018f460a93b39a6c13fac3ef305397dbca24e2127a0dd752841649. 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/US3DF2473845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc70d31af63bd992f01b1b3b5e29af2cde412ec35712e107b5ce41f5e86c56e8f. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QT2VB2400184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ac0df697c6e841ec6e8335a37c89157ec0d23687d8b8f2d5b205075b9d64049. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/USANG2448122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bec549ea8d2c51fdd05baebae5858a0d367aed8d2c90806ca02ce9223cd633f. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/USANG2448977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2e86e1275ffc8c2a3e45c880082afaec508d4b25603d1b861c72c5c16001ad5. 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/USANG2451144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1124a25e521bef43a2fd9186627e6a9d46f3af8cad68b50d2e29c282062a35df. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/US3DF2513440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37ecaf971141ea9e87f1759e34c686fbcd8959f27cabd12ee41bd126c260c5dd. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/US3DF2518736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae5abbddc33a1c5b2dbb3187c85eef15faff4424b2b223033c0ee94e1166d15e. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/US3DF2520057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26587d439c64998330271973bafac1b06d6163b3efdb25c1df90cd8cd2f8a978. 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/QZPEW2599993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0d05cc1803e0c8e284f3a9883e66b04f524e9c94d9196c08a3befa654f97bab. 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/QM6P42554852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x881802b5d9f58f5cfe48ce80e3da3d0de5011d07527b7c22c1d1195f57a7fc8f. 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/QM6P42554853.