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 0x22f67c02f20482b0ff2508a582595b3dd0fd126b27829f4ef3dfd9a835da9c18. 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/d814eb73-709b-45fb-ac07-f04f74b72c00.json and https://artists.proofprofile.net/proofs/artist/d814eb73-709b-45fb-ac07-f04f74b72c00.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 0x493812786fa83f75950f34e59ec05ff87e759fe4564a5ee3b4204d437b4f3c05. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZTAZ2380290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x218cbeac8fca4f9f505cb2dada574df5acb97e0a0aff19c32a4e9d45e1575956. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZTAZ2380291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc498e01a851d5dbfb9b7b314491ebc4d04aa79689ab290341d579a4dc5536714. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/QZTAZ2380292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8438de6dbb72a7b178ef03b2f437e3473cd5223073c4a277cfb0c6868f2e15. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QMBZ92466442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfedbf14adc8c9fa712aff3a6781823d993b1123c9f165ab98836044263a219b. 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/QMBZ92466443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8438de6dbb72a7b178ef03b2f437e3473cd5223073c4a277cfb0c6868f2e15. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QMBZ92466442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf2c58571db97688936ae1fc9f11bfe9422fd324d23e07dcf0a721da987dc571. 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/QMBZ92466445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfedbf14adc8c9fa712aff3a6781823d993b1123c9f165ab98836044263a219b. 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/QMBZ92466443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8438de6dbb72a7b178ef03b2f437e3473cd5223073c4a277cfb0c6868f2e15. 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/QMBZ92466442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cd04ec7cc247789f54f1f30e318d70c5008a64606a7a70143a9dca2e2f58674. 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/QMBZ92466440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9959eb70bed65d0e2cc48fdf03fc4b9475e82d8b9d60ff3c60f1fa96a1d5291b. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QMBZ92466441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8438de6dbb72a7b178ef03b2f437e3473cd5223073c4a277cfb0c6868f2e15. 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/QMBZ92466442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfedbf14adc8c9fa712aff3a6781823d993b1123c9f165ab98836044263a219b. 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/QMBZ92466443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a278d21a1f98c35233d4eaf8e85cdf948dce9e5236ab4aee91a9b37d5cd0fd1. 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/QMBZ92466444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf2c58571db97688936ae1fc9f11bfe9422fd324d23e07dcf0a721da987dc571. 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/QMBZ92466445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf373a82370154801f4a509890dcc563dfa9c7ce96b1cdbfa6acf91d910d14bd. 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/QMBZ92466446.