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 0xee02b7bb10f702a3913d7381691e00a2fc5020a5c38df11f76ea0bdd27af104b. 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/25268c31-c307-4550-b9cc-6b1b998464e1.json and https://artists.proofprofile.net/proofs/artist/25268c31-c307-4550-b9cc-6b1b998464e1.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 0x8cbb25d2741ffbcd4e49e3a51dca07098223cce1baace2990b4069a457553fc1. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T04:04:08Z), 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/TCABD1262913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3524238f5eb0d7a277cabb0e9f567ce4d2f4918fa66264b44207e70c47b55a58. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/TCABD1262927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79250353e1caf9fb0cf144c75c22f4773eff84be3b997475b66299f9d7d2a01a. 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/CA5TR1400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73d89e4a2d69973850c251a317b16b8b9a1446ae4d3187bb0cc15ad4d0cc3d51. 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/CA5TR1400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f8271cfe95cdc34f37d4a412c48118ff903fc79c6929980997144d270725c4f. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/CA5TR1400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79250353e1caf9fb0cf144c75c22f4773eff84be3b997475b66299f9d7d2a01a. Chain 2 (Bitcoin): anchored in block 956620 (2026-07-04T07:11:13Z), 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/CA5TR1400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e601d754e0ff47bcf90726dcb2ed7bbf5031e7218e00408cad4b077a0a7d525. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/CA5TR1400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73d89e4a2d69973850c251a317b16b8b9a1446ae4d3187bb0cc15ad4d0cc3d51. 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/CA5TR1400004.
Don't Make 'em Like They Used To (Axe Mix)
Don't Make 'em Like They Used To - Axe Mix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca265e624bd4c8a8dde596bc53a3d1cdd1ae711b26b5adc60d558bbdcc0e5326. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/CA5TR1400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79250353e1caf9fb0cf144c75c22f4773eff84be3b997475b66299f9d7d2a01a. 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/CA5TR1400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e601d754e0ff47bcf90726dcb2ed7bbf5031e7218e00408cad4b077a0a7d525. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/CA5TR1400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcb9533a22ce0c928e4189cf4193714acbfdb0f943f6f96900e1a4b4bbc775d7. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T09:08:06Z), 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/CA5TR1400014.
Don't Make 'Em Like They Used To (Axe Mix)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1fd15c0b4223b7f99f0ceb9de5df4ee09746f04a6b24f71b8306da3a22b268c. 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/CA5TR1600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd6d33e6d410468f7046459c4989b62adcc5f08749a24d475f2ab945028d9fc1. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/CA5TR1600007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb213ec64c0969b9ad5df5f59c762360c97f5a9c1c095f51ebdb6504de8d3ea94. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), 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/CA5TR1900001.