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 0xa4bc7d2364c04bce655849db8b8854da0dcaedefb305421c73bdc1c369c64916. 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/c7d4c36f-0133-4453-a07d-1843dc820f2e.json and https://artists.proofprofile.net/proofs/artist/c7d4c36f-0133-4453-a07d-1843dc820f2e.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 0xa6d1315bd439bd1eb8badaa754ca9b71873c0381f2b05b4525ffc549107f838d. 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/TCADK1782447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x646d9e03bdf919ac4957aafd6ba602db7bb37d47232e703f417f055ec5e97470. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/TCAEA1839433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0fb1d31c8535dbea2bc758b410f50d95fab3e943b9990bd87115171758b374f. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/USA2P1915296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa19ac7513b0de467e7f2ad6907e931292324a571ad41a9c0aebeb2abbc581a51. 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/USA2P1915324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93c88eb11b379be8551e8032a32a42c091b211b83cb2decf44153ca83589f9d1. 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/USA2P1915292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d3b20c211192a36d01a4c8644402d3898d604d23436ac74a3502d34feaee15a. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/USA2P1915304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc61255888c69dcae02c69f556bd7fbddb163bae0bae61c8703a75bc06490c3b1. 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/USVPR1100228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54e242374a29e382d63f20eea0c6b25765b2a5e0cd695e0fedeb4d52a5af1247. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USVPR1100241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc96032c7ea4fdab00e34ad638886ef436e970e17f47a10e1232b9487ddd2182. 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/USVPR0309051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90bada512be55565088bad4658e469e9434bbac2e501949900333597f93769a6. Chain 2 (Bitcoin): anchored in block 960339 (2026-07-31T03:13:37Z), 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/USVPR2000073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc570edc65891a53f384e831e96811e7c655b56aa6b84902758c31ee28c0fdc9. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USVPR1900092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa09e044741f2ecd275c020b7305d5d314c1b96bfd255e97ddc914ef7c5eb6b0f. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USVPR1800036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39ece38816ec972943bab2c16f301d1a25cd55bb74e1f18533b9931af09bb942. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/USVPR1700044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cfbdf1e7ff66e56d2dcb6ea244b41fb616f9ff856b52d73f0bda72f1d95662e. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/USVPR1500110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccb33a6e4f9d534c773f8f68b98cc58d24108dd4d8b1d22e72bee7b23e9c204f. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/USVPR1200102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2987fb61d440040277f5df1d45fd2619ecc30545c1737d12e82d8bac151a6098. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USVPR0208056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25a192b70e8b3d7b6b5771b40efce8715f6c8d83cc486afaa72d0f985655a60f. 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/US39N0703083.