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 0xd6c171032eafccaf6e86818baf593286d0fb7ac4b1c3b57fe2941002d13b1cfa. 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/0d1bc836-a8ee-4ada-9b3e-cf04f6964dfe.json and https://artists.proofprofile.net/proofs/artist/0d1bc836-a8ee-4ada-9b3e-cf04f6964dfe.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 0xc36545ab2250a47d1a3ef7d034e3489a61f97607eb0ba0dd6d1a5893c0db51aa. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/IDA141902734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52900af500efa36ece69dc57907c1e80b11acbc55f64345ff9403787ea8b9574. 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/IDA142200401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef65e54edf078ddc03b03fe0d8d38a8c7d24bf8bfcfe6ee8bcbd3423f36cb074. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/IDA142001676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e8b2943bf4bf4166fc7e6e959eb33f0c540ba748965ad8567716a9400ddd1c1. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/IDA142000411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1ebba3811d0cc3b502e859a52bf77612120bbde1a278ee3dca3ddf4f054b6e6. Chain 2 (Bitcoin): anchored in block 956397 (2026-07-02T21:02:00Z), 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/IDA142100472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f517770b16b2fddc53797bf1814167882e871c6fdfc1739c159271642e61d1a. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/IDA142003783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbff9471698fe3c5ec05cefe906cd88cde00268de36bff048b918450bc42e3392. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/IDA502100018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8a6d93ee56380a21e085816c80d2a1a57ee254f23c337aef8e8ab3aadcf6312. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/FR10S2375912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4be0b61325a52b49b4ea7981a6a70d710ccb9b4fe1da6eace8e7c77bf5b82f99. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/DGA052372982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cce444f655b057582a61117f16deb45f066352d3a95cfccad6d7694249651c9. 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/DGA0P2323019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7a660e1ab44aaa2c10a72a7f777a209957c26ea19fdbfa40fd07e71a0086ffc. Chain 2 (Bitcoin): anchored in block 958660 (2026-07-19T04:21:53Z), 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/FR10S2458647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9627e8f799669b6d0fd36840b9f94c91782c0af5fb008526a9ff83607161399. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/DGA052445220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf038c0a317cd22ce2ea6a0a4f4e972a868dc76e3b92b78583888d5fe1719e148. 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/DGA0S2413160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e3be875bad142b2d9bda998b0c46495d675d04db15643249cdf4d48ad386350. 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/DGA072163869.