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 0xdc822033aa975b086dc98d2751433fbea21d015e59d7c1c2fc8366ecb4403ad8. 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/bcb7c7f1-3404-4e78-833b-2c53b746ed79.json and https://artists.proofprofile.net/proofs/artist/bcb7c7f1-3404-4e78-833b-2c53b746ed79.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 0x6854b731a25f53aa71cbf4d3c90e586c14d7edb1862e362e0738f2b40f342f41. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZARB1809669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25c0d7464f2dc4a11dbfd7abf91504dee195cfb520038ed24932d96c3504db1f. Chain 2 (Bitcoin): anchored in block 957638 (2026-07-12T01:56:41Z), 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/QZARB1809670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27ae5967f7c4e6b89a46e16e3583fb315519b30decff6367d70ad232c6baced9. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZARB1809671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79f3a543bf6d826595227ed75a70da1a5bf70b51acc334f3f9314de2b7959bf5. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZARB1809681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6e508e9ac7b586fe5e1fc29d1347e416509f4b6f82aafde66f74147062e9acf. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZARB1809952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e469f17b27c2b9056670ddd53e58737afdfd66218454cf32a412e6fef7f5876. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/QZARB1809955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c8dcd75e5b73c547818879c9c76d8e282c10f8ccf657cfdbb18eb46fc303feb. 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/QZARB1809958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41af3e7dd4d868563efafd3fb225f03e8c92faace76d086f41dfae95009fe2f5. 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/QZARB1809962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd2a42f767c52fd4407ee7981d96f0e02df6ab0fdef7593419756eca2485ee92. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZARB1809963.
Boys of the Old Brigade / A Nation Once Again
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57fbac66ed29a111b70eaab349f347fefe0685ee8d61f2dde32af440fe6898f2. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZARB1809964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f0d90a44c47679b75e6e80db583fabdb0e385c78b02710b066d38d63db04cf4. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZARB1810896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a2c3759844bccc49fcb26486c0a9dfef277340b999476e2db19c7d6c16319b5. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZARB1810899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b03ca575555b8741b006c08a2b1993eace7f0b5ec2af018d92ba5245960c597. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZARB1810902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb4e642a4ece344026b466a2fd4bc23bbdee84ef9120ee5eb86860977ce5e9cd. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/QZARB1809412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e04e60782a30c31b67843408eceea08ecd2f68ddef32a0ddf05cad575a034ed. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZAPG1834152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7fd5de57efdd0fda92f700a00590bc222eb3bdb7e5e006117679d2bbaa0589e. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/QZAPG1834153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fab7e288117d9146a7b6c5a4c9bdf1a61d9c5e01f2c8a29523112bdcfae71f2. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZAPG1834160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc80590625f5dd05af3435e9e481cefa9ed5a198d10bb2ca753530171d6468650. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/QZDA71928052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7fd924feefef9c33c131cf2dd0760244027c81c38cf6d9ca700e61d05b25f68. 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/QZDA71928061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72386a031016a9a6f89637e15ef1cf1a4b6408db22bcbae74ac24d698a53b886. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZDA71928730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddd2403eb7022360b75ef56665de63e2716eae0bea9a564d0f95b31085b0e21d. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QZDA71928732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83b39d9e2292f4d65dbd070b683eebd88fc91ccb2abc06e1cb155a74fd022620. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZDA71928733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5957ec3baf8c3b9f28b0460358694ab944109df65e1f5bf51f76af7519cfa373. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZDA71928735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0412dd5af0a98a29a973c3a4291c967a860c054251f9b2ce4fbc1ee0d835e075. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZDA71928738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23efbce171f413923d8fce499be5fd9338401754dce2085f4a8d79c772e9926c. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZDA71928741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e5321189b3c46799aca0671f333e05b7ffb7f778b042bd7955b363f3db1a975. 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/USAKS1300010.