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 0x5a44a0c734d40ebcd223a26d556225ef566e48908601aa40140643b750b08929. 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/e0a4fb9b-2d4e-46d9-97c2-1ad710e5a581.json and https://artists.proofprofile.net/proofs/artist/e0a4fb9b-2d4e-46d9-97c2-1ad710e5a581.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 0x6a67a4fc01ad6c91f2d296cc6f72c7496bcd13ba6a7d89cfcebcc8a1758d3ca2. Chain 2 (Bitcoin): anchored in block 957620 (2026-07-11T22:32:56Z), 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/QZK6P2152159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1d83b62f4878e2189495b5b9b852f1d82b5c1fdf8d7c95babdeadd1f9f6fe4d. 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/QZNWQ2132165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec07554742006e7828d5133ba175ce5d1162aba844b8faf709f4c78018f9b989. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZFYY2263041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb06b2ef3620f8de2b384b501b3d0cddb16e91bc16e07cb74823e06196a6b790c. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QMDA72202403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7383d631cddc2700bd9ce27a4c8a36c0d82450718038332defe1bc914bd1dde1. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QMDA72202404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53e2e7474195518a827a9c20b341f653d2d3b6096163994119b6d406b75e9712. 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/HKC992427802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d90a00a61950fde9225ff2631392bf25f6b172d4ca5f87b26044c6070f838e5. 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/HKC992427803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1822347b8eb604d2d6b19bf21213a94d7708c0dd15b2dc883a21b2a152469276. 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/HKC992427804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85657f80dde0a4d1d78b9360ad2c95bcfb92b1dd4b593e12127d162caec9229b. 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/HKC992427805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34e94cbc14e6d1c92f0bd4bed05b7341caeb92e673cff4168bd59c3f1f53c6d6. 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/HKC992427806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43da59d3bb3179931c5ebdc73b6430e3ed3d233d45e84872df126388cc4eab14. 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/HKC992427807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda3795f1bcbd3c620546b693f4be934fe0fb1453f3c8365d8dfc8cfef16cb61c. 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/HKC992427808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x788720993b23102767090e20fcf5f87e391d650854d5c4cdb62199d714fd5ee4. 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/HKC992427809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x947dbcb6a9897d98c2984d4acaa3b0e12d9cf685ab2e64fb4af9fe32d2d778a3. 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/HKC992427810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbafdd7bad25f6a7f812103e0c3f8fd0e479eb4702beb75d0b9e3420972b268d4. 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/HKC992427811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c693bec86a8d63fd48abfc2a48d11d8f54fab63b0ac6f670790af77bf361e66. 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/HKC992427812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0294eb7a3cbd460cfe48c248d4dad7cf72faed1aab3bb872ebd19b6e73095139. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/HKC992427813.