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 0x6143f15a7f52d1101ed3991409037d43f8fee56bda927cc301e0b9cfa073b8d2. 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/3af562b5-ea41-4456-9ed4-f15a153b07ac.json and https://artists.proofprofile.net/proofs/artist/3af562b5-ea41-4456-9ed4-f15a153b07ac.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 0xe325bc9b438cd5868c766e26b0cd2e0994983e7b871faeda6aa5a5cade607e1b. 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/TCAIE2419668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa99049cbd718816646d0e3b5e2484c9d7e6d338892569af7edd93026fd8e75db. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAJD2594355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab4e5f6cf2419f3e7e191dbe12d7cff960cf80d0254e8f588b0edab69cf79ca7. 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/QZFZ62554733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc6184d7d3c8910d24b3f57799491e500f8ccd35e8ebbcf6a7c3ea666be6c24c. 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/QZFZ62554734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23e0bba94eb084b49024ba278f8dcaedc2332a6c46201661c554d001c4865614. 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/QZFZ62554735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c84ebc458a0c89cba441bec84669ed2212b9cde64c23e93b5a06dadd304f9f3. 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/QZFZ62554736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf082a03ef3dc2f5f89702adaffa9aa47c8da659fbfc4f14d155dc154d3e5d459. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/QZFZ62554737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31e0640a88231478d24bdd32326e274114542aa20fe7295aee98fc6e97d6038c. 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/QZFZ62554738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa35d8c030179539f5a0687c33c41dea2e4b205b19393353a35b52a5590dda6f0. 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/QZFZ62554740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8350c5c5c90da23f868c05f6cb6a494c483489d4323c95a4c6f4ac27a8083984. 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/TCAJC2400537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3bfa7adc68c2990eaf90d3c369576967cdd2a69af0043af8c8b78840c0cd982. 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/TCAIY2463771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x128e0b4abd09cdee3a32703cf55bd180941af9f70c44fd2e58bbe2edc8140723. 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/TCAJB2492108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96e580043b60e2b3ac540907144aef93fdf5ae6d9540bf10fe626218f2946b1f. 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/QZFZ62554741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd07c684424c076a8294aa6c99d8657584d3599375338c120f495834427417af. 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/QZFZ62554742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa99049cbd718816646d0e3b5e2484c9d7e6d338892569af7edd93026fd8e75db. 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/TCAJD2594355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee8bf323f850fe9287d83e359d7d8463a2950051c21226efcc4debeb4bf2c33d. 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/QZWFQ2564055.