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 0x627efce25762dca01e4496cc50b7c3e849da065849eb26a269fff572b95cc594. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8424351f-8d9b-40c5-97ea-ee307663846f.json and https://artists.proofprofile.net/proofs/artist/8424351f-8d9b-40c5-97ea-ee307663846f.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 0x0c0d2c63e5014bb2a9d7951e6a50cd1599942917dce7dc074899d520e279d263. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/CALVP2476227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x805f2b1a6bc37186cac6a00de0cd1b574e502f116d360d2fd001471402a87711. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/CALVP2476238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60439b3f8ebc5d9bb533fc88e408291fe671cbfab59733b3c928088521c3a886. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/CALVP2476225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc50932544f01c4104ebdb44076a9d485297a7881fa63d1b26bcc5cc9194d9755. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/CALVP2476234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf26888076f4fb6e3a6139f90290435f6aef88c4e95342eae595577f71554920. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/CALVP2476237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31ebe1bd8423f6803e720d55875581c9d36d6deafa0316ee5091a17f6ddb90fd. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/CALVP2476236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4641e1debc76a6214ad46c7a038da0db4b3ae8d60ee205aa0c5d5acebbac3ffa. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/CACWV2592929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86ae9a55a3f63840db31d739f908fd005fe6b5409c953b3ec5fa8b775cfb7694. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/CACWV2592930.
The Scent of the Sea While Waiting for You
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd53c1483f0ba61e35aa79ce298319032e3c52bb6da82df36fd463e882c9d2a66. 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/CACWV2592931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2d1291b7009173312861055073d5fbe39eafe1250e82643e47f31cf1c6e8140. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/CACWV2592932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4cd6f30e59ca8e07991ed0da8bf058adbe1464369c1af9a5cccb1ef08b64ae4. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/CACWV2592933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8564542c62336becb8c58b2c7fa647356669a342f04541dc6ba0103a3ea9fb5. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/CACWV2592935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c9e3c863823e2f1827718476d7b50006aeda7729dd3e6071a1554bdb2ba1894. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/CACWV2592936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea9c4b97ff4956d798fc530a3317d7d3c84dc98cd915322754e1e2cf341480b5. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/CACWV2592937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc45491e9d219680e3f9e48109c41e4799d1385f0240bd4c65e04eec01fd25f5d. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/CACWV2592939.
The Fish in the Harbor and Your Distant Voice
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x578b14e074090c5f61d43b7ace84a7e0320c2e5c97fed4ae0f8eef58c88e9b1c. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/CACWV2592940.