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 0x522c2a34f42d2e41f33e50341f2b98ca8917f9cb73c75f4c2f2c134288b05de0. 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/68276f15-4db8-4906-a80b-314b3417a72c.json and https://artists.proofprofile.net/proofs/artist/68276f15-4db8-4906-a80b-314b3417a72c.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 0xe5d091097c717b8c1f27479ce2e9e002f803a71e24e0caa5469bb63d44448265. 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/QMDA72160303.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9fa99f64244a91d5e11d7033307384b8c0e0419e562ec44c0cc210422580b05. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/QZRUP2101440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbed531ac2583decb98b0973be29537671cc1f68fcf5f393a286c4553c59155e4. 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/QZRUP2101445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39568829fe798e37548c6f7c6fbeb1f014bc2380b840d20573914f136c092bb1. 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/FRX762261953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34cf93b7553ddcc0bd7f6e0a1dec06dba1443a2602ee6b90c5928f4d115ea986. 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/FRX762261954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08c0d66d167367cd6e7bb4b19bc677df952220afa3c99af62459866a3fd77996. 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/FRX762261957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f8c3ec17579a5489761a913f7b334f7ad27a4b6b0aa030f8fcd8e67084febe8. 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/FRX762261960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x947580345a70669047a44b76716527ffb2f9e3a3c9b7a73dab28a942170e85b0. 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/FRX762261961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fac371aebfc67604ad9eb71c0e8d74b5ecf29dc720fd34484bfb6bd0f83774c. Chain 2 (Bitcoin): anchored in block 959052 (2026-07-21T19:50:27Z), 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/QMBZ92294988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1339bda90ecb4bf9d6c65206dc0db8dc7be5dee9fdbe7a90cacd51b72492cb8. 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/QMBZ92294990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3ed72f04e7a6abc1d5d3d7a5f04f97f34acdbb791ded3894fc635a0b9071d9e. Chain 2 (Bitcoin): anchored in block 957653 (2026-07-12T04:35:02Z), 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/DGA082341652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4921e54f34a7cdd5e906a20bda8eccfe3a5bc12e36f7924d57f37cfb9eaebe1. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/PKA062325014.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ab629029be164bbdc18f88e80b4bc361a3a2140e88fd6e25b30891b12d49dae. 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/GBUQQ8945001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74a9853677165242d63d195958f4b85c99b2d41c980eac4b49d1e1de7f557a99. 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/GBUQQ8945005.