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 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 0x0e8d8f742f6b761045055afe193a446165485689800eb70ab65e54d4d5db8524. Chain 2 (Bitcoin): anchored in block 953923 (2026-06-16T09:51:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1ca22d69-2706-4a1b-bf1b-cbc540a71ac6.json and https://artists.proofprofile.net/proofs/artist/1ca22d69-2706-4a1b-bf1b-cbc540a71ac6.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 0xed8a0b6ed24870aa1382fb9f10fe190344ab216970eea746fda460788333fddc. 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/LTG062300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4188b002fb500b1ee8b7f858e2c15a9bd8e39ddaf2671208de4aee99a86239aa. 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/LTG062300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e2d2ce860bea63b1bb6ebf8dfb788a7e48539b9621c31e40801536053a7b219. 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/LTG062000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a4372ef1a48dec234a72149271f43ace713d1f1f958c3444ea4a481845582f8. 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/LTG062000001.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75541454ec5d841afeb12c83100055a88da32e04a341a37661efe6ef60345322. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/HUA612302250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48be94d0c5313607d8db6908c14e0a07257886d8a942d05c5d69d8f879c731da. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/HUA612302251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe95b8c3010b88005caa8352daa8f26195d2ee91d9a2181c80193d2b550ab8777. 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/HUA612302252.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e1a829f269d2d9718a7d0ee00923bb2fa4e50f1e9557d315960b2a41a303acc. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/HUA612302253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62367f541b789a707a6fd65411ca80816cdaa0dddce9c9cd34673599245251ef. 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/HUA612302254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21e82035b8407f447c66af5b17803c6a907660b94a9bac03ade84726ca57459a. 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/HUA612302255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaccb95a1407c97a5b27ce9c43ca8328e91fcc358c6bee4cfa737e3c10f88ee5. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/HUA612302256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1246ca2800f421bfbf9a6426a70c3f5546396e84a45caf66b7c354826eee0e7. 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/HUA612302257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e8bdddc91954bca7cdeab05eb5a8a699afc6905c64d603e6dacdba91e9879ed. 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/HUA612302258.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffe836d0caf08a512ae9912a45aacba0270d94aebfdf806d14b6f806ddebd1d7. 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/HUA612302259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b51d0fa819aececc3d52c8a1de9afc69ff7f87e6572f045d543d735fa3a2dba. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/HUA612302260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a45ac30747fe421b2dcd2277d3937d10471de7a105b74a74c21fd187b3b4b44. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/HUA612302261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59b2e32c957d8a467861716ad0b20de7146695b2c2e902dc01096b21e6f8a527. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/HUA612302262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b0e358498841a89f8ba8d0b90ce565b19aea615997b4693391d64f874b46849. 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/HUA612302263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70a5ee7cff882a0403f12f229bf78c3474a5d07903d9ed72fb9956881f1092e0. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZ5FN2053070.