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 0x0dd381346e60edadb3caf7943186e798198cd70d65baa0bb4a672f9cb3610ad0. 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/b2647781-aeb7-4a48-8816-fdb1b4ff00c0.json and https://artists.proofprofile.net/proofs/artist/b2647781-aeb7-4a48-8816-fdb1b4ff00c0.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 0x7da2b52dc483b3231e6fac92cc1be4f74c62365db6101e627549ee260552296e. 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/TCAJF2528191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca014b96992a5e0c7b0a87b621f0e542eb25406ace900019b8ec72c932ea65fa. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/TCAJF2528200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60d8499b224b70aac4ca5fc32dc59376bad7f3601fb3b21f2fc4da4bfcfbaca0. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/TCAJG2528204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46bb3fa9836b5c7b53a4613fb4446b60e156211f80717d92ded06f10ea99aca5. 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/TCAJF2528208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7658c78058d72f1789299615b0a1c6279260bd81b301043850f25166dfb9bd12. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/TCAJG2528212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf51d3cdae559162d2d208eddfb32f37fbb276a1b9510a80366bf6128c023b49b. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/TCAJG2528214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd162c00b712add6e889554fda4b21a15df66f3229c86e43b398e76408b31fed1. 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/TCAJG2528218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd30c953189f24785abe572953f4ca0fb2084e8a62ed1b31bddb1f8f6c0a57a1c. 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/TCAJF2528223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3706f508357fe1a161a24f4e53edd24ebccd1f74198f97a6b6e3b3279ee24644. 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/TCAJG2528228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa959a683390026bd3f06d2e04ca1d70ddbf93874295dac28813bc981f2930249. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/TCAJF2528231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c05d246a84ac1f0eb8a51680387b81f33b96a989651bffefc550a4f54d78edd. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/TCAJF2528234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x555bbc6d80bc5c665ad1b0449d9eac698ac305998b50cbe576d24a790deb6d0b. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/TCAJG2528242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62dee15f74e13cd02e771429b6a1105e5b8ae16321de45830f48af87f62a74bd. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/TCAJF2528248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x065726dfffd203c71fb5e866c5e121367e3758cf07c3edd1ab30cee7ff629046. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TCAJH2531728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb6880dbd67b885c21017f7ed9bf17d399b7efaae50846c8228d175132934235. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/TCAJH2531734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x926dd1e7017c65766375d2d84067d030fa70eb3a7c1daf92f2c367333024681c. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/TCAJH2531736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa4e7150b5e0486154eb7c5df3d01282fa728fe41288504bd334c60903a01cf7. 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/TCAJH2531737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdbdd875348e2286b2e3ddcc21d3c5ab13d31ce3ee209971be2f26eefe15d79a. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/TCAJH2531739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc0eacea3fd2c744176e6d2a01d70fb7ea58f05f3af89d1da4ca8201395005cd. 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/TCAJH2531740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2d4dd01f2285f118c34881ba72611f976b40d991cc4862daf70c90a20b1d3d7. 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/TCAJH2531744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9693c3485790514f21cee10ab574b7c0d9aee8b1c27c9f6c2d0d9d8a675187a. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/TCAJH2531747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74768a18d3ecf58f3d76382b7eb3573d409ea748f3eb53de33c9fcd62281957c. 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/TCAJH2531749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b51f5e74c20e7e14f67e1f8e31cfdbb6533745f0fd643ea039b328262495344. 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/TCAJH2531753.