thumb|A Scottish hackle. The hackle is a clipped plume or short spray of coloured feathers that is attached to a military headdress, with different colours being associated with particular regiments.
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 0x174e33260a72f1e358ed599b7c4aa1adcc0cc3b1e1b0ff77fc6859edd0f69b14. 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/522a2938-8a89-47a5-93d5-535596280348.json and https://artists.proofprofile.net/proofs/artist/522a2938-8a89-47a5-93d5-535596280348.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 0xb59a98f17a00c33223c45bbdfa1636b05f37f973f642a6d2b84e8d2c9f31b1e9. 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/QZHN32261803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8466ba43b9d3b05f777107d9121eab24490e4b410ae3c5d61f66cfa49c67111. 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/QZNWQ2211752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdfb8baaf5f33a4c99439eb5014e8262e872c58f390f87df461f70fb27da10ee. 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/QZNWQ2211753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf53ed69865acf1c31432942c194bd7650d922cd1596446e029e8b06b6687131f. 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/QZNWQ2211754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62e9d1edb4b26ac9ece51ab341ccad4566774f09b1397c85c147c1e13718bb55. 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/QZNWQ2211755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3b4c227c0707456ab472affaa043cc07eea5e486e3d7becd951f9258c2f2b64. 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/QZNWQ2211756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb59a98f17a00c33223c45bbdfa1636b05f37f973f642a6d2b84e8d2c9f31b1e9. 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/QZHN32261803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc12c5b5aa31ef74de74aa12c43ee68aa01ee1e1e5b54bf23e4c5b34e7b948a64. 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/QZNWQ2211757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1058c105e95f26115a9ce0bd1b5d00d1b6efec0026311fe849302f3faba03cc. 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/QZNWQ2211758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25579eff1b07d840f7c53e5d63938eadd408351de1856b45203bf45e433d0d8c. 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/QZNWQ2211759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4df8a54f5e2352e530531c55b63a47b353c299d121447c3a686b370f7d4845f. 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/QZNWQ2211760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c73ef9aed61d128ace96733542c37e0ac5e695dc798d90311343165c984e3d9. 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/QZNWQ2211761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc615d5c5b368e16be80e2d9414c951216cac956d28f923e7db59df2ffc0cccc1. 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/QZNWQ2211762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0368adf96ecd3e85ef58cbd0f2bc72172967d123f0c90cbea3b34ed0b5bd1328. 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/QZZ792469329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0368adf96ecd3e85ef58cbd0f2bc72172967d123f0c90cbea3b34ed0b5bd1328. 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/QZZ792469329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe914674090ff7fb875986c30874fa5ebcb87fb8249cfc8e9e319c72a9c20046. 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/QZZ7L2464037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe62dad4e991b32a7382744d5e32a63d6170e6659790f430a490bbd8354c5b9a4. 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/QZZ7L2464038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7afef7e8efe70857a1f0e20785e3140bb488792ee54a41b35ecb7161ecf56190. 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/QZZ7L2464039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4e87e8bd686e284bc2d84b9035a0df843e4b169bad4bca95c93b5164c0045c7. 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/QZHN82446407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd21a74c0a8db72fc21689f319e2dd03babf713981badc2ac415e19771c3f1594. 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/QZRP52242801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x489611495860348eae92d2d0fa3603e3772db874d886838b093769cd54d3e488. 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/QZFYZ2305507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fd38e53d57a01414e2d756f6abee499af34c31a845039e1e8f917b9d04c440b. 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/QZNWU2188819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa71475cd5af0b5e774f56d2e56997c6110af2ca8aeb9e1d80924b76968b35681. 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/QZNWV2173898.