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 0xb3cb42fd14aae8f67c1933a8f70ab2ae6e177ee11fc2608447d99c8bb73bd7dc. 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/945f7a5f-715a-40cc-b132-f6fe1d2ad6b6.json and https://artists.proofprofile.net/proofs/artist/945f7a5f-715a-40cc-b132-f6fe1d2ad6b6.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 0x8e505c2d6f645f05d268e0c7b5e3f6786db0d55e5f10b0208b3cd4de8cbfdf09. 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/GBSMU0995972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde572f6ff2b47e0a3e4dc854981410db5becd35d5c7a8db90fb0f51c808a2800. 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/TCABO1315200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb328860c6bd06c73f51da32b843f695ee64b02aaa18ef38416855609f22843b3. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/TCABO1315208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff5ed93284bf3b5fb1902377eed0654a2d092b272cbb9955c910a7c99b8d6154. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/TCABO1315214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ebfd704f7bcdc5b6cde56aebd0c2fdd856ed79c13df485ba83dfd05251e1724. Chain 2 (Bitcoin): anchored in block 958126 (2026-07-15T08:17:14Z), 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/TCACK1526637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf09314bc253209dbc29d4e8bcb6e2b5e8c5e8b16fec9ee0c824b2a193f63b151. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCADO1840446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12e63634e42cf3493f29afbadde63ad713cb115059f51e516049f9d89f86f9ed. 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/NOHUS1801190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd77f3414ad34aee8e201458092d7b9a81542a05435bd6a3530a60776f2f7049. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/NOHUS1801560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x291c63c8f75c4642dab6e0293d4ac6dd307e6eae16ede71b3c2edcdd4f5277af. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/NOHUS1801640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3be00269132af9a45c7036f32d30f43ce68e749db2b4d5f7c6ddedc486b8ce79. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/NOHUS1801780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe41006736def02a3f13e425c6cc76ce2316b41460dbb0830cd5a7a984da24469. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/NOHUS1801650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82ce7747d452fa5b6f93aa7f8cbc2d5cbd72c0a1b5e6dd28749f728022be0c64. 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/QMFMF2309555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08bf6a8e58d821a34fdca197a50d0cf6d499a2fb28111e2114f8faf641794a5a. 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/QM6N22432856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0281f8d8aaa0ab749e20b4941830674489636066e242d980038bcf3506f2158. 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/QM7282470731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x270da31eea0ad2fd220f3d075a1b70c3cbf8b5c237cbc814863081daee97be9e. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QM6P42435684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f646833195c9e93146917edd668f814d3fc50e9c09934b1f47151a650a471eb. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/NO21A1701024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48d5ed53a21eb24eb26aa8ddda54e62c567cfe1529ed9de5447f4c3af2a1b161. 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/TCACY1756698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63433334eb10b66a5f9158ab3ff00fdcc54f3acb72e3c54d5318a032a51b6197. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/NOX9X3461604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0281f8d8aaa0ab749e20b4941830674489636066e242d980038bcf3506f2158. 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/QM7282470731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x270da31eea0ad2fd220f3d075a1b70c3cbf8b5c237cbc814863081daee97be9e. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QM6P42435684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x293cf911345c1dcaf70926d9a2ca29300ebfd2ab0c885b096251dc5071483273. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/NOHUS1801130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a0a3843d9dcc9c625f8b770585fc5028e8158c7e54cdd621aea08a3f463580b. 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/NOHUS1801670.