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 0xfbeed20eb6ef522025dbe81f548b711ed6fba208d7cb59825f73e81d028cb568. 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/41a40903-288f-4bed-9ca1-fb24d3f29dee.json and https://artists.proofprofile.net/proofs/artist/41a40903-288f-4bed-9ca1-fb24d3f29dee.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 0xc94d8813f958efd682a778f7825c29ca40c97ef260801695259097f8fc755666. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/PTES10003901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11e9957a1b2b2255e543c6feb699210af4c77d728a6ecd9a1c57eeb985979e70. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/PTES19501601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9897254515df8d4137bc1f7754e0f07b13ced158b2a8cc65cf30f51b5edc3089. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/PTES11005801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbdabfc921cd5656939e053215b619eecb67c1a8ff462aaf0417a2ecbdf83897. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/PTES11005802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd12fd681aa07ed8765d2808e6949c3c729fd2b094888a2c41a12c1244f043218. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/PTES11005806.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0693b88c1859e4af7c77f7e79b8b35bbc06ba97f81ade3568c44d18c7b1a172. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/PTES11304702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa432aedcbb51dad91e7ee8dd5209863023e5349c8487a010d23ebba4ffbfea53. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/PTES11304704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a8840017c6352dc5f80c2419b26b913dee9f4b942bcdf7ef560cc521daf76e7. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:35:19Z), 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/PTES11304709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc79ad47866dfa6493b7e105777e655ee63ccef75bae2a58f9a6f52461455234a. Chain 2 (Bitcoin): anchored in block 958682 (2026-07-19T06:17:12Z), 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/QMDA61345464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17f7492f570b52795d1454af48ef7f9dd54020237c347dcae8121b7f9edc3537. Chain 2 (Bitcoin): anchored in block 957613 (2026-07-11T21:37:58Z), 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/PTVI12200021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x437ef1ac2b6580d37b8da413db4e40f282f8de00afefacf2be5fab9fddd41d5b. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/PTVI12200022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd9c09451f98073eec253706788b9d551fc8b48f2c67877c72d78e4d0b049da5. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/PTVI12100295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8512ece6f5ebf3477f295ca0c4b66b631ce970b5af542414318514ac0b878d7c. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/PTVI12100296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb74464348cc6c84c3d8e004ee292c955dcaa89cc25cc7068f99a7bb7ad40e6ed. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:00:23Z), 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/PTVI12200317.