thumb|upright=1.4|The Norman () keep of Rochester Castle, England (rear). The shorter rectangular tower attached to the keep is its forebuilding, and the curtain wall is in the foreground. A keep is a
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x659eaefad8ad996e23df9a7cb28cd105d5e1ffd7de6eba97c0495cd5c258be69. 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/0c5ac346-fda0-4cc3-aaa0-0ee7469eb457.json and https://artists.proofprofile.net/proofs/artist/0c5ac346-fda0-4cc3-aaa0-0ee7469eb457.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fb8d0a201e9fc7cb55df9672e07db6d42495880071837f154b3d76890187337. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCJPX2399330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1255a39b009719be698cbc3b23d9ec6e0a7dd8e8261b23f105c838c73a5dcfed. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/TCJPA2457588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13d6ed151db699870a17ac33fb8988e5bb78ca17abe46c047cbfbc659cf6c95e. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/TCJPQ2137284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7928d7abe59c60c8e495ab7fdaf33fb4af0148c1b4e5b4b9b7a3f71fdbbcfd0. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/TCJPC2433713.
Frozen pasta 3 times a week (feat. Milky)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb7a92b83afbae86d94fa483d9c16eeb936e53a1e5183a1a899716dad2082383. 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/JPS802400169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x092036a0e12e67b903033edb34555110de59000088c2cdb6b3ffad084c09e6ad. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/JPS802400040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb928ed0db9882c144525d898a7a11d20f17324de2f8e883e3a8ecf4869861b40. 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/JPA962380329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fb8d0a201e9fc7cb55df9672e07db6d42495880071837f154b3d76890187337. 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/TCJPX2399330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13d6ed151db699870a17ac33fb8988e5bb78ca17abe46c047cbfbc659cf6c95e. 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/TCJPQ2137284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbad004cfc7b945be68536cc3e68242dc0f2d681ab73d0aeb546dd7b629e63f13. 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/TCJPP2159470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6b9d2696f89e9f2de264f381303e74a7ee104d6981fae778ea331e301f5676e. 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/TCJPP2159469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc7d4f831f54b153023a3d93540982243e6d37044350c9d7f70e69c7cfde9ee1. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/TCJPP2159475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7e1c1dfc1100fe838a339e759cb3d608f37330eef25a2f86b286eb25f375e57. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/TCJPP2168338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x916a099533af6194d2adc6fb86df9e81e9d35cb5f358a21fe702b2bfdb30d638. 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/TCJPN2185325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee4b7da08995fb19b4a176304e65684a52b832ae745825ac185b251ca0e38700. 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/TCJPT2241577.