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 0x82f7627eed81eae1860adf289a65d42e05ce7d5d79686eafb3e1df4e6f1fa2c9. 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/1cb904a1-9c2f-4193-bb03-b14d7eae9eed.json and https://artists.proofprofile.net/proofs/artist/1cb904a1-9c2f-4193-bb03-b14d7eae9eed.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 0xa6f439957d4f2f60954b7d6fc07697ce9b084b9c6892f210f8a4428f0a5106aa. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/CH6541992613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d28680e09d6b58090743097c164dfd05bfee2a9faea231926bf86f9fe8320be. 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/FRZ052000500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x285f70f24018b392d5af7e183f37e99eb2b50b3b291b47a8ff9b37b839b100d9. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/FRZ052100413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19768936491740aee6dab5db9058126aa4d83d87cba4374e86491600144afc5c. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/FRZ082100391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bc63cd473c15f3d4bf1c418ba1108f8c146c1b44dc8c2eb4484600303db0434. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/FRZ082100393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d28680e09d6b58090743097c164dfd05bfee2a9faea231926bf86f9fe8320be. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FRZ052000500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67d1924590ca739021c294be7dac3e1753d5a431a5fa98041d5afa1e15069bd5. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/FRZ082100397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7fb8ae708ee5ded2f14fb4dcc47469d9cc50699e9063337bdf86cab52fc3ab8. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/FRZ082100398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4614942d674398b7a4e4fc95d28c73ea70f1616d0d2ecba6b46c5e3a1f972fb8. 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/FRZ082100399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x983b7ae7535c91460e1b666049f3d771d47cfb0b90f807d00e79ddc515f7595c. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FRZ082100400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d527f035eb924c9d2ae40c2439104d3245120eeddd4390538f41dcc1d8b1d35. 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/FRZ082100401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a2bd48b49891f3edcbb08f224e17d8ccb3529ff16a5beb2f0b1d5042024316c. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/FRZ082300100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22297541da520b1ebc42ef8a46a72e66faee0362452cc875888bd12268e2b4a3. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/FRZ082300102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4db0d469dbc2f6bb08f6788b67341e16a73637e2e9be82078f9f7945786740c. 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/FRPGV2200066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eb4dab68ab167531940087cb2ae1907eccf4dc7c3ee89ef2c9baf01a6a04949. 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/FRDJK2400050.