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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73bcf4e8845a17314b979a0cad3f3d2af17e12804479426b0445233ed0f45b98. 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/3eb9aea9-8407-4e64-809b-ccac8620a179.json and https://artists.proofprofile.net/proofs/artist/3eb9aea9-8407-4e64-809b-ccac8620a179.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fb846e3f5383f508d5e1e6f65cccf2fc3ffcf564d4b1128a8560fb8abaa3f43. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T23:21:05Z), 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/QZF8N1935119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9643182c50fd13393b13a87a5bee9ee5fced9d0bd3a18fe881a71642de3de47. 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/TCAEP1918899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66ab4d53a6e29895596addd1568fc92d697360be5cd9510fa00dab702e232a4b. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/TCAEP1918947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7f27244e05d1c05634e66817b2eedf0c9795184b4aec6812e0700423b92c099. 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/TCAEP1918950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51793828ee1b863df9b553c09a543a5089bc368a93801014f741acf33d99280d. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/TCAFB2022887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2226bb61fe37e28c0a333ce51b7ffb2d14085ff806205af7d2c0f9167628adeb. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:09:54Z), 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/TCAFI2153497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb629868d0c2c675536c481e89bd99e6cd79f54f5317d0d2ffb060ce8494a7517. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/TCAFO2130217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09d6bd0403b204007e3e5d3aeec9c3cf610c697e71446acc37688523440cf03a. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/TCAFO2130240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfac7ea4969fc6cbc421a45f33d88fbe73e7d6e2ca305a5db12a86e1e353ce47c. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/TCAFO2130175.
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 0xb547a3666884103b75cf6c613697254b9075427cebed5b3001fcb4372e5378ef. 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/TCAFO2130184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c63f7bd00aa7b116c70f314ea7f7c606a5c12cb537e0ab1d73c3a0de37b697f. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/TCAFO2130219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a11417a3653535417c8432a5a90acee865a6ca91ebb098c71124ddc24c73e1c. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T22:21:49Z), 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/QZTB72378204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cab71ac115c7dc0aadd27ac192c1213bc800a37a03f7e077ecc3d9351d432c8. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-20T00:09:17Z), 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/TCAJP2546911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x252a178fea7bb0edee221a1d15699060dcbb2033ac8c175cdaa45a2508a0ae3f. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZHNB2010020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x617ba2f74e95aa4b34f8e03dee37b87459069890676066aa9c5a1d7925f861d8. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZNMU2072802.