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 0xd03a418f83fe8687eb5511b91259eb7f09c9ca9c80126a5ac87bb5fa58ce1dec. 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/8eac25e1-b373-443d-aee5-6b44cfa2ae21.json and https://artists.proofprofile.net/proofs/artist/8eac25e1-b373-443d-aee5-6b44cfa2ae21.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 0x2c20eb5c5af814e9c4e4a716be850aeefa23ca2b7889f33227509bbd1dea9a5c. 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/QZ2J21507199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x414a689569504283fb8b6e635558cf73a22ea6d7cf0a976201a676f1369a7685. 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/QZ2J21507110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9cf4f612d846750ae389a3dab70a3230104c2ce8da267d5537f81075505c44a. 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/QZ2J21506725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11ca43e7549b3bca825e847c320452744b6f0ac586c9a3c183691d40d1dff590. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZ2J21507982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9cf4f612d846750ae389a3dab70a3230104c2ce8da267d5537f81075505c44a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZ2J21506725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4db4ae6cdf650ece93b9eadcc2e200945648af91b95eeb4421f893bf224a4c5d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZ2J21507983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c67fba7349551aa81a0fd9e86f1b10e3032cf04c72a0a7d473475ef3a2dc930. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZ2J21507984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x806296b9a7e09e2b853932c0c4b2bec7bf830f757333fe3000c49782a5615b52. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZ2J21507584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x398670950b26260108d9a9f1c252ff98aa362cecd7c61a61e0d1ab9a0c82896f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZ2J21507213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x414a689569504283fb8b6e635558cf73a22ea6d7cf0a976201a676f1369a7685. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZ2J21507110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c20eb5c5af814e9c4e4a716be850aeefa23ca2b7889f33227509bbd1dea9a5c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZ2J21507199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd040211f9759b7088d1be3d93e54de1204c85280d6e903d75aee1aeb065c2e7. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZ2J21507702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcaed3c75f9f7d4011518b478e52ef17531d862e532dedc91bec18e1c36298d6. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZ2J21507985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89641d687dab834cabf2300782f789737663a8e50b0546fef473eb9df310f5d0. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZ2J21507986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22a8783514759de07f56561d08707a39624ffbf2315db9127ee4d3a7b603e8d5. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZ2J21507987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9c05141cf8750d3861723274e118dfbd9d45e8770fce79a73c667bbe77cb0fc. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZ2J21507427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9c05141cf8750d3861723274e118dfbd9d45e8770fce79a73c667bbe77cb0fc. 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/QZ2J21507427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd040211f9759b7088d1be3d93e54de1204c85280d6e903d75aee1aeb065c2e7. 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/QZ2J21507702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x806296b9a7e09e2b853932c0c4b2bec7bf830f757333fe3000c49782a5615b52. 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/QZ2J21507584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x806296b9a7e09e2b853932c0c4b2bec7bf830f757333fe3000c49782a5615b52. 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/QZ2J21507584.