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 0xe38de6e2e3b29ced5736f53d0b88f5303e72d0e909afbd681b7944b4a412ec0e. 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/87d4b808-1da1-4e39-9fa3-a6128a628d0b.json and https://artists.proofprofile.net/proofs/artist/87d4b808-1da1-4e39-9fa3-a6128a628d0b.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 0x6d998804a7b3d2bfcff4d4ab3f89c5368f326b195bf1e8e5ac8ff9df30df4743. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/TCACO1610205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x883810a32f451bc2af2f6627c6b6f5eaf934e7f7fd934dc8a4bec07a1c00acf0. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/TCACO1610211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b965d91ac2c282f20914fee6fa6906b430a47c379ed48903f3663d8607112e4. 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/TCACO1610214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aa84e4cc6a581dde7befe32b6f44c0905459eee0fc02138c7359c7fd96534d8. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/TCACO1610216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0b9dd32b63579da63e7c098c3697ff825f2d1dfcc7530fdec8c89c2d3515bcc. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/TCACO1610217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff3ed64501c296f0de800dc89f864cf775e7723a1d363e1df96ec5b3b267558a. 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/TCACO1610218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a8fea761b3fa9cec1c952b0c66e9ff81f26c21c06d353b4e62db066e53c8bde. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/TCADI1704511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd914d925085abea1dee1957855f09ba59d241588501cbac10911fb40251dd8e1. 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/TCADI1704523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefe9fddfb0a30232a7f5cd11333d7902fc3432dd882c93bb529031cf15954711. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/TCADI1704527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b30e7a02e302a8b0779755fd17ed9d8960b2ceeaa31632483c63ead340a4887. 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/TCADI1704554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94dfa2a0fa921ab908c1825cdcd83224adbaa08c0623c9f6f0d9cc7cf5acdc9b. 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/TCADN1812880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3871cc00f72a0e589d539a7b3714b3bea2024e6a7e735bf2ee9055e68900c01c. 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/TCADP1886955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb109f52308f994806855f50748ee3422a26a5303d33f651bb3ebc7d746ec8c71. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/FRX201902842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a089888981303977e35d722ea220c8944183ddffdb63ca9f830e1d9f2710b90. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/FRX201902848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45e2ec59ed1a97bf8a04e430de7a06bf68d71fb7de01be95117748a6415f2ce6. 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/FRX281902726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65e6799c9cef432e437c29b025a1354df90e47263b6871212204f4d245328aa9. 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/FRS182039919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9c0b629c0c67b633326cfb5aa77936eea60780a4b805a6d047b9b98e2d65afe. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/FR2X42178010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x041545eecd9655f07856be116976441294a7b11b2b931d46290d7fdea36db3c3. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/FRX762104537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa84ec4501143a312b88ae844268eab9d21b8dd998c2dedd5d7277b83455cb682. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/FRX762147477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9e2f7584c3b3c8a299b617b41182c885b1851a70b8b0f7eafea2646be846710. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/FRX762161253.