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 0xea16b06e4eff814257a4651f7fcd70a193f1a83e100277939397d3ad391178d2. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/835c4e39-6f55-4775-a657-0f2e23d262da.json and https://artists.proofprofile.net/proofs/artist/835c4e39-6f55-4775-a657-0f2e23d262da.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 0x1a9ca77cb6ad7c68b190867c6c8b1e0779d74deb136e9562eacb615332dad93d. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZWFH2370619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeea587a280096b156d4ab2598457b497ccf2b3f8c1cbcc4cf64ee7be56482591. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZWFH2370621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66f6afba66e4c7d52b3565d3be1882e9df635f162c89c068b8dd1ab5a64f97d0. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/QZWFH2370622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45a77374111e6e9e8451d1ab88158e4c1562280360edcf218b78276f183a87f3. 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/QZDA72190981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa44cbd5e51ba692b028e8a66141fd27a84b1a4c5491c7c6e1cb76d1a35c0b4e8. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZDA72190982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x270e2807b110c93cd82e6dc6df9a52e54bc18c3a4d4d0efbbdf770d70b77f961. 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/QZDA72190983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dd7e5654e22fea78a337ead35bf5f5551ff6cb305a26695688e8159bf6cb4ab. 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/QZDA72190984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x286569660c926e7ef2f9f3760a9ca02632c4edf27fb049f7bd4f9b9397aa8d69. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZDA72190986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42a5fc8ed4736f3d138414c6c6792491687011ba142c294285f04618d725ac38. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/QZDA72190985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed1752fb2948e0330798d8a2909dcc90eaeeee5f1e3a0adcadf5a20682d45736. 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/QZDA72190988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cf8c77520adc98ce7077b57897d5fd22a32b1e1ff633d09e0158e2602417c2d. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZDA72190987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6827e78c53ba4af9d7f8a70b5596830b90c4e7cbaf274a72858840c7e716ffe4. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZDA72190989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ac4f67206536ab909c651569ab19e03a1aae110b20d18c7d58521a5b995251d. 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/QZFZ42323277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01f404f49933354907569866b2974708bcac7ea8a0295bc339d2ab627682419a. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZTAU2289243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe142479e016fb68d97269fcda48eb9af678a315a287a5a902a9267cd0894dd86. 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/QZRP52296056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85cf1cfcc35be772d968a7f5141320a081e9892713dd1d3c8d4da54f48064983. 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/QZDA42266357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1af213e23033d3794be0b511c392bb2bcaf33618d0b4de5ead4b6a0e0a5b1ef. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/QZTAS2196472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c13de175db482a2180c108f7733013881107e9ec417e6786f9874b162dc1640. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZMEP2194371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c5dbc948dc14702ad92be3afb6bd12461a9af4289f245d1ab5ad9701dbf1946. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZK6J2099354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eebc8a7015a906cbb47192a44d10db3f56da76049697f62956e8bf02e83f54c. 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/QZK6H2093601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c3e467702b51ad3f98696f6479c7c78905d0a64914cd2b1cef0358f5e89df0e. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/QZES72037793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x131cd085637f4b531f4cbb111e764497c3ca1ecff43eea1fc4298fd0c18204a6. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZES62097267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27158580a6e406b105bdd03dd90ca6c460a59338acba25ba1c42cb9c8f043b5e. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZES62080568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ef1973ccbe42fc57644b80f4a4fea307ce63c7362f6ffc758545a012d617fa9. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/QZES62098443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c3596691377184a62d71e2243df25bbde874a31f419be24ec09a5b90dbf3e4c. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZES62079458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x110311185e3d0dad043ab950acc827efc02ef305e123f51942778fad819bb03b. 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/TCAER2015557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d36f0a3097ad74e8f77ef9bf68f4e95bc4f9c58ff0124ba0071bdcdabb6a3de. 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/TCAEP1909015.