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 0x654d7e14adf5023ef970da2ad70772c83a21207f4c1d7e239d6fcf40f9b7fec4. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6f2c3422-f8f1-4ef2-9a8e-b8dcd8c0b303.json and https://artists.proofprofile.net/proofs/artist/6f2c3422-f8f1-4ef2-9a8e-b8dcd8c0b303.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 0xbd50e632f70bc3176c0930cc3da5bce2ec6bb950072df7c52f60bffac1d6eeaa. 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/USKSV1604201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49069937450247f15f956ac973921c66d053dd7990707ba2ac90555758b8f100. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USKSV1604202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2276ae05e8289bc5083fc1d0e7acb90b40214a9034cbd441fa4803bae20772b3. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USHTV1100557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x339ba3e282df0ccb5e054dd1eca3c05bd4222c6d1969c56276921325c6f859ce. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USHTV1100558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x015184eeb7688d622ac7f87d7cb2cae3665faf92e4923abcb4c58cb659ce75a6. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USHTV1100559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10c486b2b861cb599779b1fae1b266016ddea59492a5193e221e8b13d09d2298. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USHTV1100560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b49c5a3aed43ee850f6de979a02e32874e873a8046c6e147d7ee6a50ca303c3. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/USHTV1100561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87fba5560b90e6e96693695bd1085d962551f812ed24b35c28c3aaeeee73f732. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USHTV1100562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc73305e850e07acb870d794cf737dab6d43354893d05055e14767b26e402899e. 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/USHTV1100563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf8838c6e4a475c8c7c30269b732a1481f0af4a04ca7b5803a56bf587883110b. 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/USHTV1100564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad37791f54092d0ec780f93fcc3e8dd710b28dc69a122e0966999839e0c08ed0. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/USHTV1100565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91bbfe2bfe1edd15f7d1a0aaa1be5374283645b1dd82d05642c460d841d48d73. 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/USYZC1002001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf868ce83ca14c9503d009ba841ecd5a22861826f6b31c7a3e496cfb88c00adf4. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USYZC1002002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x662c1d4507e8e833059927401eea15a03629d885569bae2ad25075ffb3e7915b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USYZC1002003.