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 0x80a90080bc59acad09c6cba70df600ee92326ef1dc9c32e422a0f0a7911b4642. Chain 2 (Bitcoin): anchored in block 954010 (2026-06-16T21:41:36Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/34454588-636e-47e9-9993-ee5e6e85bd1f.json and https://artists.proofprofile.net/proofs/artist/34454588-636e-47e9-9993-ee5e6e85bd1f.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 0xec4bcdb2d1ebaa1edc5a8aaead558ccdf49aac629ef37f1d418d4b24dd1c3142. 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/BRTRB2303222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x764bccf953ea79ec582ccb630228bf13579b2947fc26f8e21d4c99c586eeffbd. 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/BRTRB2303223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfe9ee4f111af0eca183390bcfa5c47d6ecc2f2c5e3484161bdd799053a47751. 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/BRTRB2303224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x249e49370c43143c42f374afa266b36ba4fa48ba576c8f35751bd62d2f8be804. 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/BRTRB2303225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb99c00b319836c1a2d73bcd156d4284259e04f34610ba59058876452ed281af6. 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/BRTRB2303226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47d84b5171e928337a9d993ce7fc8a1e46b63262340e19ac3b2ad4d50dfdabcb. 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/BRTRB2303227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7bfb9c763efff64e3d1d624e973216da8ab974dce4fbe3017c3f9e28b693392. 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/BRTRB2303228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6e8a51d4f07b72a33ff42bbeeaf033e5b6a448a4a7018d40d8b9a7f64f28271. 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/BRTRB2303229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9f634aa699f7f303a4caa3a6b62ee7edfe76240510faee5ea76b29589f2dbe2. 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/BRTRB2303230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33deb22be83e18e0bcbc7690a8956728b8509653e769ac3a391436fac83dc3cd. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/BRTRB2303231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39f229e014526ff5ed3cf02a41cfe0942913c71eb83fa2c1c05f384c8c181660. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/BKABN2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x751a530937e374ba06342ab447af371693ac93536ae5adec560f2842c27b44b8. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/BKABN2400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d32bab7520d575a0cc3a22e180629d2d8944e6992f9ed4aa844209b6b98c6c0. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/BX4KX2400060.