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 0x918560cdc0beda4a38b5ca3baf57e6c19fa8404c4b778988c9d86dbc922e957d. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f5f069b8-c73c-4c69-a718-5ff0caaa92f5.json and https://artists.proofprofile.net/proofs/artist/f5f069b8-c73c-4c69-a718-5ff0caaa92f5.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 0x8825a51b828dc89f2ef29096f471ff2917412dfbb8bd27e7a483d642166a9e12. 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/FRS182158833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5220684645d0d3d664401fbe7f6bab357cdcf21e57d73aa841a4740dbdad474d. 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/FRS182158834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0988e552b1bea2ce4eb7010bc24f24e4d590992f9473b24b265ab61408512c31. 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/FRS182129456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3c567f3262c9872e8a31c590afc88734bdd77fc389e61d6a1c3dbde917d3725. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T19:53:50Z), 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/FRX202257019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13491d755aa9984c90e98702ac429d819f595a94258d28affd8c9b8f48aeacbf. 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/FRS182160860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde0e389b5cc958d8469f0fed31328a7042e49bb0982a43a28dc4eda4b3fea89f. 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/FRS182160861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2cd9ef71e565029163df40abb4caef56a77c79ac37ea8ec109fa148f0aa7994. 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/FRS182160867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x655c6fa331de800db7c5a9bf5f9dd5582f12c5f79abb1add538f179bcc608035. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T06:58:55Z), 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/FRS182160868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12587abccf5d23775bee91d252aa28f3e0708b5a660ecf7035d3e061ab7a71c1. 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/DGA052084811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc167d9bbd059966858401d280d24d1069e224cf1ab5375216c47279c3a57cbeb. 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/DGA052084813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5860e287a30e0d2a5a3f866cc8e4114b220d9b664a3c2abf370ddb5fd92be27c. 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/DGA052084818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ca7be6be3ed0ff453fcb3c96e0ae179f02a30fad2ed2235284e5680dcb12a78. 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/DGA052084819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41817ccfad04784fe31e10290c9b82472a110c1b602e812345037b4d2236e013. 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/CNZ792100239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe7fd1eeb5a2fd30c6cbbfc5df4e1e6c5dbb99e464f1c525db0b14f470f8bb5c. 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/CNZ792100250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72205d541b247b711f66715aed8f63ef33618b0879c5d3fcd22e27b2ad31e280. 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/FR59R2473252.