Mar, mar or MAR may refer to: Culture Mar (title), or Mor, an honorific in Syriac Earl of Mar, an earldom in Scotland Mar., an abbreviation for March, the third month of the year in the Gregoria
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 0x1421be5b71a4c20f23a6e16ddcd7ae2fff51bf262b681cc9803d98888e4a18dd. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c02f40b5-0ba8-488b-82fd-ad388510c8be.json and https://artists.proofprofile.net/proofs/artist/c02f40b5-0ba8-488b-82fd-ad388510c8be.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 0x9d7bd85656995118f0b01c0d633c92a66c6eebd2ba8af12c4c12f1c588d2ccaa. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/SE5BU1780296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77f7380b750393cf5b5cdaaf465a6dd494df26407b0017e53db976a3199465c6. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/SE5752230888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0a70124354ce3c58298185d2d9ecfc8c735b079498990d5618dc61cfb7200cc. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/SE6I32325775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f5f2de9a9fa22f5a855ffe7416474322b72fa97738556114d098c8cd208b927. 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/SE5BU2546211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc51aaa4feb3719ab356c58a950f62870e44ec3acf87cbf74cae9dd0607406ea3. 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/SE5BU2570008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb9e2d9ab3787daa7579efcdf3a97f8979e3e9e96e6bd1e5894b18199e1eb512. Chain 2 (Bitcoin): anchored in block 960231 (2026-07-30T08:33:28Z), 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/SE6HN2418859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59b91ab3b46ed09e76631d5497fabe004385bef97f3df1712b46a42ce2ebf4d0. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/SE6HN2418860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x097ee623427907b327fcdeb94b84c4d9595fd06529263f929ba62da4d281191f. 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/SE6HN2418861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39f6b587f38078b9a5c318921e9050e86bae7655ace9909cfc62c06b17989f2f. Chain 2 (Bitcoin): anchored in block 960155 (2026-07-29T22:13:32Z), 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/SE6HN2418862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54467bc90ee6c28fc0b8433432db8e367c596b1142f409a9656569a56164186a. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/SE6HN2418863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3c4e2e12b4cd629557103c24007c2c22a0420f56a1ad1ba0acef53cbb2d8cb2. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/SE6HN2418864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x438ae5227446ff9a020ecb483c0e16b0d5fa3b829fabe12e5c96f3e3fce52820. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/SE6HN2418865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a657a129115c51721dab7b2014be7a07dd2460d15060229a1e15109536a03b0. 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/SE6HN2418866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f376c596f7e10b153a18d1f8d7874bb95556dc74ad20ec58b44b421f81806f5. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/SE6HN2418867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21e56e151dd3614efba74c092b4c4a1aedb9fe45a3e364b593328350310034c2. 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/SE6HN2418868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b289d581deaab410cb5959b76dced6a8556adebde6da542f7567157da5bf70f. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/SE6I32302529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x556abe7b07c2501d80eeb1456cb2e8fa3ed99915a74eea9888bad6bc05d43787. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/SE6I32302535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x476a05e7044f1cb64136750ac2edbff0f6a4c6526d3c47e107a27a5aae4a87f5. 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/SE6I32302536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7937beb39c672467596d003e31cb540ac67252c03ec63130a94b76ec9df6f64b. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/SE5BU1889405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c7c31c51ad736928758b1ffcb08eaa9d948556fd2abb72065fa3031730207d6. 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/SE5BU1889408.