thumb|Tiara made for the French princess Marie-Thérèse, Duchess of Angoulême, 1820 A tiara (, ) is a head ornament adorned with jewels. Its origins date back to ancient Persia, from where it was late
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 0xdcf63d08ac5f6bbdbee6c5d9712897dbfae38f7e20cb045e870f3ec2e8d86622. 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/5b770462-92c3-4a89-a84a-013d73b64c44.json and https://artists.proofprofile.net/proofs/artist/5b770462-92c3-4a89-a84a-013d73b64c44.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 0x23070c13719d6ca9c7bc211f2342773c80a61a574193062202b0d34197b24e4a. 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/JPCR01006390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42831806441795c531f98de4a7e0d6d6721328ec7dc1dd4a337886de4acf0b2f. 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/JPCR01004260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe42acb4cc83da44bf3df68b658e990e67ec6af6783dacdf741f325a7fe8d6aaf. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/JPCR01100030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c2fbae3d73c8d220d16d92f2c79bd33b171048fdbac5e786393bbd2c3e837dd. 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/JPCR01100040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fa2fbb00179953f8079c40ec0bbb5a477707b6b50418a9a4b478a1d71716714. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/JPCR01100050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5a15ea85ce78698cc0a30768370917fb6eafcd8fe2da2d4482f24deb6769d63. 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/JPCR01100060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5b7ffea5a88375fde510f725b7534910364ef60b4398366e9de9aab66ef5360. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/JPCR01100070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9811a955231d520c9220caf9d041c888d35d609d08f972193e4f45bd20666de. 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/JPCR01002770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x104a8cddecd7053b46da794eef130f49f9e1b3563523fa22d80e7812378892ff. 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/JPCR01100080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad4336be5d03c5a6ceaec55e4ce8f389e438c6ba1a0b249cb5d1e9491b6b6156. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/JPCR01004270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ca7ca61c1d1e6b524b3af7e09ab9bf4d0b59d16a852d4a75586baa09a5fc218. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/JPCR01100090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc721d479e8a64be5a234e55313ef14a5a772f458ae9da816e1136ed7e4cbc4c. 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/JPCR01100100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba52cf6cd2cb94a8c79e85fc27eed89d51f14b183f70e3cb474fc672b0af9d45. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/JPCR01002760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac5b47568d23fe5ccb8f69e1d9f856458eab9d65886fd6bfe9f33e804d23d002. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/JPCR01100110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a6bdb3e3e34ccc9d9d1e76f91324c9bd3f2f7dfee533315cbf577cdb8b3fb62. 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/JPPO01013410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc7bf90c092015194cadc1c7fa64c238d285196ed56f355f1cab30e50345d880. 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/JPPO01217485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf97f2cf28d82825153d03d9e32eebc22689504f7ba345b4838a1a4a0ed50cbbc. 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/JPCR01406660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe53d2d9e3d519162fd33176feb46aa04fd285331081cf048a90dafa46971808. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/JPCR02004540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9f66c22316c5dfdd4e17160ad17caed17198d9b7ee38ac42f86e76b0b75ca54. 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/JPCR00905160.