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 0x00441ab580524b893a0718af64b6501df961ea4769d555e48cf39157061b07f5. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bacb710b-7864-4d18-a2b4-1344f30ee0e6.json and https://artists.proofprofile.net/proofs/artist/bacb710b-7864-4d18-a2b4-1344f30ee0e6.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 0x416032f2e27864b61a53035167cb4e638f468e1774f116d06517adba14d9a198. 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/TCAFC2066231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bb5dc90019e6d5e7a41477073197d77d6c0e3bd4b4511103daf2d699024ea12. 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/TCAFC2066241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x467a6d5b7b804ea9a78e12bd7b8862ffe9d350a5cd7f9660cc38a5080e51fd12. 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/TCAFC2066247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb694a30c42c56d388edc7fc36a447dd59408a7bcc52a8a1ab2d96883539f1dda. 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/TCAFC2066250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc86aa153ec99d6877092547b92d0e3faf4f7bb392c359eaccaf27c06f3c14772. 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/TCAFC2066265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa20df10fe1deb03e39b41b92da73d952a498ba43e1df60bc6f38aeb5cb867109. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/TCAFC2066269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e1b0f35f23d688040158e103173642baaf2aeaae282b92818d72a5ddeecbfa0. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/TCAFC2066272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9131c8a625bea6220013e5633cc5a509790c76e0340413d8331eff79a91c1fcf. 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/TCAFC2066277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeff1bf5a6b014ba9817b5aade2bbe0fb4ec567fac5451532d27252762d8b3619. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/TCAFC2066410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0008bbb914976d57f7a6eced22b54770e282e59a270e787124f41daf7f074b7c. 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/USKFR0500472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf67e45a29dd878d2e387ef64a7f70e20e2f5e105e95bd09c5131f313bd2fcaca. 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/USKFR0500473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b3484038a1c59e5962227ebde76b2ad3fc0943f8d5ed38647161fe52a78b531. 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/USKFR0500474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99447f5cc4d741c21a441d994a69ae3ef32eacb65c289f4c260b5c52f31aee6f. 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/USKFR0500475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75c2a08594589fd83a32d4167f1ff5cf172cc7272b08db93e3232359d5e5990c. 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/USKFR0500476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdec86936120bc5f19da6af4dcb4a9b8aa767e694b2656bfa83f283766c499307. 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/USKFR0500477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb884e9f81b1470bbe9b03b5e6ad1fb34ada6682b1bd3e61cd641b52b9232c60. 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/USKFR0500478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3498d31b6ddad43f5f48fa2a1cd7746dbf464fb761f39b4d1c6b5e3bc6b3c3c. 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/USKFR0500479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a1b75e497d78a86c9e8da18c2131d487bc158e70c6667a383b4f73c5d29f8b2. 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/USKFR0500480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d34d0324823f1a2a5562f12f47a3267c637ea32fcef6f7dc1f0d98c9dde1fce. 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/USKFR0500481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8789b27f053e2ad1c7ca546ab66b7d2570632de1c51c00f4800aa9d6b097bcbb. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/USB4U0400055.