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 0xca3df31d875b8f760ca073a2189f169688183022c3f383fb53e9fc600d724ae9. 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/22a1634a-5efc-4d90-b03c-885fadb03451.json and https://artists.proofprofile.net/proofs/artist/22a1634a-5efc-4d90-b03c-885fadb03451.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 0x8a8fdfaa01da0007a61fd70ebe2e2cd393c89bedf30505f3067ed4794bde64dd. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QMBZ92314489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd246d50a497a77aa67b6b47625b0387dcaa2a2b34f4d802ced0a77db2c6a6473. 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/QMBZ92314490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb845df4051c56fb2e52298797f387693912dc4115d6c3b00012582c52875caa9. 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/QM6P42227160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabaa9a150b000cd4e52b6ae9b39ada963e088cc1299a7f51281c6e22fd41616b. 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/QM6P42227162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2d9a82b9907c226fdbc43a27d7cf8ef789c11c47e27965f0fb589676923de01. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:36:57Z), 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/QM6P42227166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d417ecc28179b470ddb0f34425a017b3f48eb569e2e9fc2875b5098e5d6b7e5. 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/TCAIE2475727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7569b228846e1112e817c5968ded1010548d61cf60f8e401fb617f46d3b56bb. 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/TCAHZ2470649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd49162ffdbbedca04fc26d23e242fd53d86c9b888908e8d9275fd3f7f8b9caf. 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/TCAHW2480629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ec99d440647483456d8d2071579dce9b4d8b0fabbd624683c1724d13f678dd5. 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/TCAHR2366861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21dbf14e85f1a7b873a051781c68e373b4f2c5a77774ff98c595a3a26035abc0. 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/QMFME2388464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79f4f17b3520a810500629007cd9568801845e6e79ee914ac13fc831a5fa20a7. 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/TCAHK2365541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d43a5e7d45ffcc9b37894516c5f71bb353ee4248fc6322c4bf067df6966482c. 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/DECY52300375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb97a4ba416389e17bc5983a8b84eab7d92bb39e38bb867a3337ef4930bbd90ca. 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/NZBJ12200103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4134fbf80e721972b86a60901c8eaffcfb91b382287c6ef6a0200ecadbe50df4. 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/QM6P42227156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33fbd289f554dddbc15bbb2af4c39fdcb1dcb7c35b785aa3aadcae42aaa8b677. 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/TCAFU2188108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22cbbb8d3edbcabb0c44a62d262e1fca02f4738da63f54ca068a913456e6c7c7. 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/FRX202131639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc01a81feb5aa31e95c793316e80e5c1a5af405c3d6d4d23b88ef3342c98353f5. 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/TCAFO2128994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6388f9462e39d5654b5f2726754d4093a5dc5c556561be62c39d8f4be8ac1c2. 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/TCAFJ2188568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b9da5e60b3be983bea3c2a9b97457219b549398ba84e6b3431c66d2ab73e5d3. 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/FRS182078419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6043af963603e0198cc9a23cdaba3a38d8941fb874aa6a0f567563952b1cd74a. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T16:36:00Z), 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/TCAFF2023729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90b3d60a3a5d8174371283df7b3da727b4681560c69d8daee9189094b0968482. 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/AUNE32000082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf20b2feef07db20909b902d3f5556f2608223f06cf7b40f81f2fb2b91a2fdf86. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T05:09:57Z), 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/QZFZ72026791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03713d02e57e5a8fb615474a951eca6aa7672aacefa34e53a6c6e0e2ec9db4bd. 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/QZFZ72026792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28ad3ce4b0e1b625ac62398f0222ac13e768c3d0706583c9a3590e5853a4a236. 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/TCAHW2434655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d88fe76c71a460749a42ddb8ef9cf6036cfcb1e8949289b55f5745fb695035a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAEL1918740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d542d2bd80fb3f6f7a6d2dda493ad4961d04138e177e41f2eac21b5bb908589. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/UKACT1931555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf6dc1699ca219a5d8cf04f298b9704a408600957e44d2c6626e3ab0e545af19. 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/UKJLC1700018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00cdf49ba231329ce2ccce3604a1c74037d1b4ec0c1dd3729e8502e007f07242. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/UKJLC1700020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x898a73c5da5313c3d4bcdbf4aa2d18ec1b8b87a74e1a807a6748cf6afc58bd4a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAEK1953100.