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 0x7f6c3337deb33550dd5827022e0d1ef8efb4c3a1cef606a167032ab561952f00. Chain 2 (Bitcoin): anchored in block 953988 (2026-06-16T18:23:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2ec284d7-96d8-424f-9de0-394896af5d4f.json and https://artists.proofprofile.net/proofs/artist/2ec284d7-96d8-424f-9de0-394896af5d4f.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 0x4015cf8c230af72810bb2360c72607610a8d78fcda5597dbff5293d8a9c3366f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/FRZ731900091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7af728e320b87781652fcf54a30b3ef23fa891b0f66023a86bba59ee53a76787. 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/FRZ131713130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44359c653c469296f182fc206addae0e9053f6c3a9fbb195dafcd9ac68c0564f. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/FRW822100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2423f2277b0533b8f4b737d45a4bad975dc930a4223186c40100c8e5036b6f3e. 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/FRW822100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddd78a973d92b6b65bd08b589ca49f960baf783e9546c5928c530a4dc3b58b08. 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/FRW822100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a27b7c4cc2982c63c07752f249d32aac69b1616e4204e1bf29859f6bdb6a8c8. 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/FRW822100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb514db1e05b6b603a93e7a2b9da2fe974da4677ada98efb3a60f8847df0a7a6c. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/FRW822100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dd1d073fc4449cce7b585457a37dbf81778588de00302e7affa2fca3cbae3b4. 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/FRW822100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaa43f87364f4b3986e592c5475bdc77232d8493cdede9999d63abe0da04af7c. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/FR6GO1518160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1b9e32752b96246c43f88b56c97c4b864eac88a70a560ea23fa0582366c5b3d. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/FR6GO1518250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadacccecf8875ac66f20e34e10535b8f3ec406b4f54b1684522c3a00b9ea9aa0. 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/FR6GO1518170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x979f078369d296b6a475e32c317c516e45729a2aa8cb828cca0d20900876bd15. 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/FR8E71201240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9446906788a2ca868b31b7b3727c20b1f90e53575b5b586fa513eb8704d877e. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/FR8E71201250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30bf81fb9c1804ba79d7fdf38b328846f6a05a767cb51f1dda5402b04953a0a0. 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/FR8E71201260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3340233663d6b3894f3f1047d40ccffc4b99f3a314ba2285a475398ef08480f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/FR8E71201290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa79082315885b89ef64ecc087327fecf5a0e3eda20b41070d26b5c68d1a8f03d. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/FRE7Y2300140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdea9521e22001e83f9659a27d5c8a927dc3bf2989cfb4ee0a70ebc01a72bb4b3. 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/FRE7Y2300150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e3c723a6a98a04d7f21ec95999d75373e6d724351db4b1b061a217c8c700220. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/FRE7Y2300160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x432c2bbf2bdfc2ff7cd1200241e0a010aec61c097ffd1ba2f89ec005780710b9. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/FRE7Y2300170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd217ef6904db34c61553d332b5949998e713be10b2b49693ef6778381765b67. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/FRE7Y2300180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf060e2fc30ca6136517269f8758a92cc7150fd9d8ce865b8e5ab1c51f45109c. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/FRE7Y2300190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8403b7681a7f1ef96a0e63994c28301dc519efc2f0156bdd13b4eaa0104c07e. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/FRE7Y2300200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x920e4c9dc02d926e5755e6c28928d97d6b0cc0ca583ce8e3cd3da64cec096516. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/FRE7Y2300210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07c6f3745270a2b3f9c00a0bd288af6803557f96fa892ae6e936bdf5e6d822a2. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/FRE7Y2300220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f26a9642abc6a7e098f69736ec12644918e864c0b1f55d562f2b8651e3d634e. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/FRE7Y2300230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8403b7681a7f1ef96a0e63994c28301dc519efc2f0156bdd13b4eaa0104c07e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/FRE7Y2300200.