The Group of Experts on Action against Trafficking in Human Beings, more commonly known as GRETA, is the monitoring mechanism on human trafficking established by the Council of Europe Convention on Ac
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aba8d2abf6dfdcd8d9f4460246330447c355f1409da36229571020dc2672a59. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a5cd482b-aa96-481b-a6f8-5dfe73fec936.json and https://artists.proofprofile.net/proofs/artist/a5cd482b-aa96-481b-a6f8-5dfe73fec936.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae6198e9a71211119119812c931f880c258730bb54a0c247e470c7cff56ed5f1. 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/ITB261301510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5864d8e998fe485d662f42d135f8b1998ca86c958d91d608959420d9f0490b23. 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/USPR39400466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54d87c759aabc33dfdd73cf36f7fbb01f2b0bafd042dd4bea639b0ecc45c43e8. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USPR39400473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf93efabb77d30a6bc06b1c8f3448f8af1b333ab0ddac587a064ce1654c424965. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/USUM71818707.
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 0x4f0a27ac73c6ca70d71d3e86c4018ba02250ef9384a5e60e39358d30caf01ed7. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/USUM71818834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4cd63bcc4714b8a5c837bc637f73cfbb516d81e91da840dd15562eb9bbe2724. Chain 2 (Bitcoin): anchored in block 960384 (2026-07-31T09:54:03Z), 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/USPR39400468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa2ade5ad948e7033bab191d42ef1905e6d245b9006287ababf2d9129c45f08e. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/USPR39400469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6116356c1bc7b2a641734fee0cbe642b84b84972170e9fc3c7ad5cfeebaa3178. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/USPR39400470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb166d32d4321ac71bf2f69c68404d09e8da1d1ecda4eb4c8802bf8be62eda5f6. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/USPR39400472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x775da6b275ea9eaeb1f6c1ef8ea29a990b8afcea1a76abf94610dd019ae5699d. 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/ITQ031600120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bc0f3fb8c260dd2b140a8b3fb2a649e63d12be8ed24ffc305343afafcee3d87. 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/ITB261300260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x955e85788adb08d8ed921407a9b1b1c954638e6318a718e23bc592e1026a3a99. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ITB261300290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf8f2f65a8a5a1b7d2298a8dabf62ef02113f993008e87db64545409611e7442. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/ITB261300250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x833a1811959409c7d3453df501e5833bf4d4a776085fd701b1b29332dd93fd91. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/ITB261300270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x537268897445667705e208cdb525c512bfb1f78e2f2558f1c48189181434180c. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/FR6V89703157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a04b8d869b4a2cb0461174e689c62ab69f203c008ae04cdf9eb93131666d8f2. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ITA810400205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72a90a4d7dbd28adfece957054943d24bd99d39eab3200aea3a3cbc25033c8c2. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEN061900677.