MRG can mean Millennium Research Group Minorities Research Group Minority Rights Group International Mouvement des Radicaux de Gauche, later Left Radical Party, France Red Hat Messaging/Realtime
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 0xf0b0c822801bb630b1f12572c69b564cff4c9f30d457f730a0007771247119de. 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/d91b4e3f-f551-4593-ac65-cdadc832cc5e.json and https://artists.proofprofile.net/proofs/artist/d91b4e3f-f551-4593-ac65-cdadc832cc5e.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 0x11c2db3fb19ed2257f7792fa89896414e6957467d7a86194c859ba24e827135f. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/TCADJ1740007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0da8d8d552c7bc129b9b86be249f239ba600553bf5faef9302742763584da6b. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:55:26Z), 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/USUYG1517514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcd1430a227fb51c2d782e380c9684ed5285ed000c8a1ce87c0a89dcc999e4b2. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/QZNMU2089829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08cd35f557b822d2ae49a05ccc31c9584762ef5bcd4c5d8c1a2e69c4eb2b04ef. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZKUS2105085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fc9cd912db6634332f5c0eb1448d2c8bfe2419bc5d284fb42fec116514ec037. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZKUS2116136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1667cec81f94e2fd56cd639781f66fd572f9be939c0e3820bd3bc888e24c54d. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T12:02:37Z), 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/QZKUS2131790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf667df44556bf1fb129e0fbafe749e333b0575209f6a11703cdf49fa2e2ee7c3. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USUYG1499581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8b6b48ab361f6ac18ee9ac0625a45a34f04da69e534543e4814cb97834e646a. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZKUS2154341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2e393a7ecb8fdcf7d0017d3619a4cecc9784086dfd95c18c60c91fa26e15b5a. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZKUS2204061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1a4ba174d8cd4357944dc7c2328c5f3bc7e8bdef67ef903f29385980936f08c. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZKUS2207264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe601536cedd6f896f6ee1f723a0683d2cd563887098639e2f216efd6f0cb350e. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T21:41:49Z), 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/QZKUS2300447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28e6e739ba8349b620fb19cbf9ffe766f37b30f67d38aeb009640b59860e3624. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T11:56:53Z), 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/USUYG1483638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8923407797a2ffbe971fa432f7b8cb8e9e74e49a67679e910c2f9e59663dc631. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USUYG1500383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe60aab6cd84d61d4b5629ff582a9763214367c1ede5aa74858d9239f15f40352. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USUYG1515318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc68a96c574978790cd010cddfc449507d7f98be580caab7344724eaf5665c597. 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/USUYG1526982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7de1fdcfac55549994b2ed4e67372dbc4bf5d20f6320fbab05e62cd578059eab. 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/USUYG1534777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x900fefc5735a35fda9efb759eebdffdcf4cc1d6b02f19d2f2edddfaa9ff49689. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USUYG1550147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe06f4a70c1f88742641c2e41b4d6cdaf361d8fdccaf54f78f135fca1177ff04b. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T21:47:19Z), 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/USUYG1568496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb81c7ddf46315decb0c7572f737f2e1fb824aadf36204de186ef5c191b4031b. 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/USUYG1576655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9669fd8d092b7ade9284780c654fbd75a4da2e00751937c41a849b8c3d670705. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T11:35:27Z), 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/USUYG1590886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d9e5acc09f418fb2d97189433f24a216143551cbf5188aa93fcee5df9a1b968. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/USUYG1728740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14dca7aa5709f3c0f9eedf8d934fd2a4f859d4d6242d78b95e53fbddac4f5407. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/USUYG1755839.