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 0x1394724a8e27f3ebf962433929e9ceb8c553659b7e8ce61aae311796a8bbe815. 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/aa4bec2b-1c46-4813-96c3-1b9d8ff08825.json and https://artists.proofprofile.net/proofs/artist/aa4bec2b-1c46-4813-96c3-1b9d8ff08825.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 0x36c0e96153e474233bb9d6f17e8b11c508dafbae3c5971e7d953de9fef41a91e. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/BX4IU2207768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b0503865c7136a6df7bc5d887fac4be4734d288bd3fcb3147e5523b8656759f. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/BX4IU2207813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0372af10c97b9fa849e69bbd4cd22c6d2e5bbd32bfeb65d4ea5b626e99218368. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/BX4IU2207785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4a2c88109935ed2b6f470435d77e38558be26e127b3e38370d8d0fe584b7b7d. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/BX4IU2207786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9572b98d56834230147ecc4ffe30e3320741a3ba6e7b5d6be2db5b2235e008f. 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/BX4IU2207787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03a0aa4c8659cf2321751af2ed1b2717488cac064758157eb89940b6cf81a916. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/BX4IU2207789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39904d6ad677ba0d4c04440988a7ce10b37de687f2b712d387062e2655ca951f. 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/BX4IU2207793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1661aa7a5623e1017a0d841df74622120a3adb51e087352e74d996378be97ff. 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/BX4IU2207925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5544e8235c6add204afbced59d34c3c11fe6aecd456f95eec07f360b5f886a1c. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/BX4IU2207934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x543cd744bb6957a74464759f3d0e9ca5f81f06f5e4ce89fdd8a87e02cbf99ff2. 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/BX4IU2207936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50423c1291b248f5e2f946d77843b511fae2a19324baf20fe9e5b2f40a9304f0. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/BX4IU2207937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd9b30e68d222509dc4501fdeb27ffc13a6122fceffde90929c89ad072f3797a. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/BX4IU2207938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9a38ae12ed35b360e463270210ca6de816bd18d4fa4663090cd9bb1763c9250. 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/BX4IU2207940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb367a5da7a7133f03a153aa0077628ee6d3601ca789de63812e684bc1b3b6881. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/BX4IU2208012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x231a85bb578c97be39ff2bab2aff12ef44f260166bd3f8faa955ca7859268c3b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/BX4IU2208014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd69d827ef8b8a83621841a4a1595768caf8f15985770b585869c421f10c801a4. 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/BX4IU2208015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe69a1bd19853a936a463f72eb0c19d1bcfabbc7bd3b977d1a2568ae8a3e46b42. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/BX4IU2208016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x827a5b9d5a6d1ba4f5824415fdf1176037a213b6e20d7f37d62b976beaa29d1d. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/BX4IU2208017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d04bcc75675153556151a3b500038341f56ed8c0686dab8bb0f1546984138f0. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/BX4IU2208020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4252c46aeb684d425ea8e48d942909602dad0de98c7fd24c62886f0a42189cc. 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/BX4IU2208021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f53bc3ab84fe94ddc7d5c855256652c6d00038299d53f48c7e98bf4f61f405f. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/BX4IU2207996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8912e3f92a3380a0305a3e87da9484a6caff0ccbb3a9ac1f0a7150fbde46286. 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/BX4IU2208003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6f757e3e01cc37d26391926a2b611afc84b5b1a2acc9be6d46ef6570054e2a8. 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/BX4IU2208172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8db8f35236b828cb620112db50cdafc3b6a8e4fb069590d874b78cbaf7147f5a. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/BX4IU2208184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ef18abd5dac3f9db54b213907f5e9546f24a8e76d72a6b6503b2179825fba67. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/BX4IU2333614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6a4768a97c4273a1ffcf52c82334f78e31b288ecaab85fd44ffe308c5de204b. 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/BX4IU2361822.