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 0xfb4a1da6fab120ce06fda44be2c8929672f802eadca16ed4db343a5e22714f5a. 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/f0e2fbe5-a928-4dbe-86f9-98c57f8a0f9c.json and https://artists.proofprofile.net/proofs/artist/f0e2fbe5-a928-4dbe-86f9-98c57f8a0f9c.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 0x86bc6f2a054e8d350da0494f5785392e68b32c602d76d54691f115b02fb927f8. 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/USWB11104098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95ba11aa141cf6df04f77a6fe36ecfa215f51ed81f888b62a94824c78d9d2d74. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/USA560643059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa51d20978c4f6d120a837471d19e86a43ab0d6587bcb0c086d92868b1c5060de. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USA560643060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x170598d22797cc6bd51e6ff61b4901c3506bb96eef63ee65fc88daf58f09b04a. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USA560643061.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf019db24ac3d56c6b83f8e852f1dc63dc197300a6e57e42b2d37fe8867aae956. 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/QZK6K2500585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47f4d0f594b789be917076cb26d644e02f7ce36d3fbe1d8fc7fdc95f00bc69d7. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZK6K2500586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0456347882a3b02f690614a905a26233f103da8e6cda48949445bbdd4c2f3ec8. 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/QZK6K2500588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf23f7f5ecb3518ea9d5f744953f0ce7c9cff05955e4ac8dc333d866d7c55b66. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/QZK6K2500592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bd72b5cd5d221a4c503a5200dc5b1358480cd86b7a700cb6a297ecaaafd051d. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/QZK6K2500594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x096bb44e855422b86dec16167c6fff49526efad4e6544fad02729225ab1cc462. 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/QZK6K2500595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dc1219d4a86341561a870913cb59911008f73b3237c42f4d9ff264b849b27f7. 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/SEVVF2401404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27db77ab70a43825efa6ed45e98b7ae154fba356615cd0472c0f5a502e940302. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/USWB11101153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f3a661505fdebb17e3fee1dbdecfafb3daba41aa0d1e678e0325fe6fdd45cf5. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/USA560643159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6b011a1fe5e0e9f1621b881a3d9219085a33d4aaaee76c8332d6764b48a723a. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/SEPEL9902010.