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 0x21a0661bbba726cdd438a46678bf52c7e8d650d51f916ad59949aa3846a8ef90. 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/e92f1715-3167-4b8a-ab41-11df17dc0094.json and https://artists.proofprofile.net/proofs/artist/e92f1715-3167-4b8a-ab41-11df17dc0094.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 0xd99c1bcde283aaa8537846215053cb070a9854fbc2d39d4740faefdd4586c3e8. 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/QZNWW2150104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ce05a069db214066f76a69c988618c789c0bb30b7a07c6052af9321c64eb644. 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/QZNWW2150105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9e5459e78a229bbbeba09f9ea1ccaee85bd34833d4414ffd817c50969271937. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZNWW2150106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1f3413b01e554ce5eff5f4ed0b17cfb364f7a0eedd1d75fb4abfe0b8cf2e437. 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/QZNWW2150107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46365fefca71447005549537eba20b270d53ef3d9337ace6d05cdc6c98e5f023. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/QZNWW2150108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7b5db16e022721fb73bf61abcb73bd512713801ad57027aeb62d6253401f3a6. 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/QZNWW2150109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7aa391cdcfa358c679b9db0184db3689085ce2f11975ad21b1e289c4b741db6. 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/QZNWW2150110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f2aee29ee35ae62a34135c9d4ef1aa93c4e8ba232b67838bc68d18e456cdc5d. 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/QZTAX2479089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x283f828184f8f6abdbc078b8a8a72aceca36d1060b3a993154d04998762ae8e9. 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/QZES92499046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x362df031229143ca24230fe437d5a01c5d590be99d0bf9f54bee7edcb1dd8358. 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/QZDA82476047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca05e80510aecb19c0bf8d49d3c4c96234588c02ed5c76de8fc333ed1cd9bea6. 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/QZES52270208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dd16fdc2b5708595a5180721700f334dd9d68081f27ad749bb10d96f1129954. 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/QZDA52189788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec1c601602800f23947278ede92ee4597f5edc80c9e9f3f042f59a1ea51d719a. 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/QZMEN2068785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x720c602aeafe3662707981bd7182829afc75611fe7a5234ffeb73b5f015b0ffe. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QZK6G2006507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90a644b66e157454bdf64e18b98e7f4d8f0e45d4cf3fe0e5c64b071083d10864. 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/QZMEN2068786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c024c55fe816f231892857b85234f9b51314bc9ac7bf4dddd5a2d9be7af4702. 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/QZMEN2068787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde2ea1e535b7ccea7555286d464b51afddcf7b288e3259a4d733c72d5fe51e5b. 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/QZMEN2068788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29c33aa7c39f509bdf26c38e74643c571b7dc11753dfca4ce4d813f41d72a890. 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/QZES92042122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x720c602aeafe3662707981bd7182829afc75611fe7a5234ffeb73b5f015b0ffe. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QZK6G2006507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29c33aa7c39f509bdf26c38e74643c571b7dc11753dfca4ce4d813f41d72a890. 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/QZES92042122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x831db64d34f7a3f3d1144b881a6139ac12677c2c765824b5dccd094a7605e4ec. 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/QZHNB1991741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7de67a3595bb6a470885e5f5730e51a61d123200a0fbd673dbdb1192d0ea80f. 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/QZHN31913169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c306df9c84968da5053aea3c1d6b3068f4b87a9250fe6cf4343810083881145. 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/QZFYY1999317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa88d4576e949553e114476858468284ca3398e9a239a0b538cf9f214dbe5014b. 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/QZFYW1928033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa616e2bbd4cefbf5d8bd7fc540425858e2275eba3655c03d7163212e61e3c24a. 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/QZES61938435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x145cb0ad0f9f3caedabc70bd2bd3e766f49c7960b4bb9d8ab2f3cfcf6b190d90. 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/QZWFR2415497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe67a62fadd37eac49eac0d44a5070776fb38bc098f05ef035ea065cde1a15af7. 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/QZTBD2491088.