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 0xcc5ace97e82263c5cb60bbf6a3a8e28a3762ca71e62cd43917f68b330be2c5d6. 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/34e8563c-08d2-49e7-9d58-3c67a68644aa.json and https://artists.proofprofile.net/proofs/artist/34e8563c-08d2-49e7-9d58-3c67a68644aa.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 0x15c44f3247b974d274a11f2503b82bd8ea16708359dacbbeb89d86b9c23b2cfb. 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/BC3PG2304916.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94953f2cff3893ec634f08e6f1885a04a28677837adebb3a3853a764effda4ec. 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/BC3PG2400516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf72290665d5bb7136fcd9da69c779ffb6c87c296e9fb3de03a0d6f4dd7a9ea56. 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/BC3PG2400944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9fb5536acd38b04048eec793a71f0c0e767827fa6c2b04d82ec0e4ef6994d14. 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/BC3PG2400469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81b3ddbe33ed0461e55424daefa4149322fc560e48c5d5a9a83962d336afa57e. 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/BCJT12300625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9f4b20de18f87838907127f993e916569595fea3451fa980e2536cea9a21a37. 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/BCM9B2301222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa02526ac2b1dc64905c50aee9651c7b69e9af6f35d0db85ebd86e4a3252f901. 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/BC3PG2402228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65910941d05330bb880071159d6c7371276e8512c5e0dc4b0130b48ad5d4c333. 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/BK2242401797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x126caf0a4fb85c7e425361924cf69a11c1db16ed439458f94bb3821edfddb9d8. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T15:00:21Z), 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/BK1P72400078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc410c17b09075d304713515d550cfe4162523674f5db877fb8a3263015ffb6b0. 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/BCFCV2400636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9526194da7e433694c28476e9e2ccb152bab5ca30ed6a4177cc52e759feeb49f. 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/BKF442400015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0af7312c41f179db51a04148729304a66e4f351e27502171d90881fbf7759cb. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/BCM9B2401291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44df14c2ec71fa6ebffe9dd9fe4df472f5e7b4239e4bfc4d2f41878e2d7c6232. 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/BCM9B2401288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x295f862c0829b491ac370b7a868733c221aec7d4cbe73ab24d570b19dd3acb0c. 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/QZTVM2425200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd06be33d0f194895112a9d8a91dd578352353b5fca9b16ed75cfe2b978991f6b. 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/BC3PG2402902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x027fa5d6e2497bda58fd130a552d943e5c613a390944ee6a4223d0b9731d3b46. 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/BCFCV2400943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a28d6de4e46499e3ebafba828d5b1455bcba4e6ba2b226d672dcbcc3f449489. 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/BC3PG2402761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85c9a9c0c8e04efc746f43861d91be38bb2eb84675603d2b4e048cc1b5a3a96d. 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/BC3PG2401327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d99dd14647dec8b5bc7bd4d964f079ce349ef9bdd5497f3c45a5a73ee9ed0c7. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBMA22418376.