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 0xe39c220441c4e44f5d479d39880d966ee4bf4e27a01c832c7a414957b944fc69. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/29f06e45-5a98-4e43-924b-e29c70e0c37e.json and https://artists.proofprofile.net/proofs/artist/29f06e45-5a98-4e43-924b-e29c70e0c37e.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 0x64d21e87d2e529c21ecbff8660ccae2111b25a87dbb3834245b0dff182c48ff3. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/TCAGQ2291892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ac86a69029c29160c5ade16b209bacd25d0b81d1d76a53feba6a339c244b0ab. 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/TCAGQ2292469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c983ee3e72e847cab9407a541edce2b55b142444064424d22c746a4c64c2422. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/TCAGQ2292052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9409a5f8c7f5847d8f350faa5b23dcc40b32f798e90b00c70dc50f0a3ca2475f. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/TCAGQ2292095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfda7eae87a1803567c86784b38d0b7030aa8c1aa69f9696bea1265fda882f4e1. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/TCAGQ2292394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa270b3034d364d210559230d26ea7a72506ba561c42471b4ffd022063d12be24. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/TCAGQ2292404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24237346715dad94030e7d681dc042abd51080edaeb2446bb4b999856ee1b92b. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/TCAGQ2291880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce80db2fb5a2e7a632aa15ee94dd3286f339ddfa836cd7e732f893184ab69cfc. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/TCAIR2405727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2129744849159d133fe921c4e11c88a449ed4f3c0777c793bf89c0618ebb8c9. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/TCAIR2405741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38c6fea3f977d42536fbafb9351586bddd5a42a5eb79e9e53645a559574ee727. 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/TCAIS2405748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x139c7cb531bb68ff624072618cdb957aa0ccd20d310da771dd53378d6d72f616. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/TCAIS2405754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3235cd1853dd27fe48a7d88e43c43a552981fa15719d49304a804c0ad8984d2. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/TCAIR2405764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51361ded03d352e5918a349e9327ba84a627315630ec3d2daa2c1d76243881a0. 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/TCAIR2405769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fac679f3ed078531f7b2e9578de5798925416f9a9d1d63cb6bccb11fa80e0fe. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/TCAIR2405781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x084c86841545753272d924e13be43628181ca34a96c20fff39431dba9c21d6f1. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/TCAIR2405795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1185c18eee9843c6096d3712450e15a2338447a5010d304f156c81c9fb826b5. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/TCAJH2545217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20b7b369f0951260dfaeb2345390e023248938573a56c459eb5a19ba19baa2ee. 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/TCAJJ2555429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf30bed796ca3f306d0b666b49bdc0a80bb7a3eae59c0a89540012dae109636ab. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/TCAJJ2554593.