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 0x21d063cd3b6318f843292ea5e857625cd3d1a8fece623052136f89539cf12f40. Chain 2 (Bitcoin): anchored in block 954623 (2026-06-20T23:40:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cc61b40a-ce3e-4e63-a3c2-76844a4ef868.json and https://artists.proofprofile.net/proofs/artist/cc61b40a-ce3e-4e63-a3c2-76844a4ef868.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 0x0712dab0aef8961584213c0867efe6c24d51a73bdd8abe816d4ad14f3ea46161. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZTRX2577314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cf75a5cdc2359aa0b6e7582d441e361e2c48c9707e01af4098bf6c6161a5fdf. 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/QZTV32546558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa81b43c8c2a3305f2b0879f10ca59d733ac9d9aadc585ba29f3adf375de190ad. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZTV32573006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62c6c70b98668291c6403b63a8162ac5ed658aba0b7daeec1bed0e05fa7648a8. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZTV32573008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ed908fcd10aebce902356bd5f8ce51109bc29f162a0e805e52d2af554f21f83. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZTV32573011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3b5adb7e46a5845b4c762943dfa1eb972ce380768fe166cdb4ea3ff2ec705d8. 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/QZWDD2503868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda13c1246126a9558e092c28fb378ee8d401e250885cd802f60c13fcd073d8af. 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/QZWDD2504524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1bee24055aa3164b10e05f67d0ab2db2d0769d7ebb88af79edb07e11185bb46. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZWDD2504518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe47e92e1010562b07dc122085002f92291f4392d1896c5a478c247cda426e99c. 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/QZWDD2523172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1471b4d577460355f221e0e36727915cf89fde68c97639c03e2f282ab94785f. 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/QZWDD2523738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadbaf6498a5eca0bf53cda98b841f7cd6f39f0e6dad4b51d5e01563d32c5af8c. 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/QZWDD2523733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad77aa3e1beee876b9118103f9db8d96ba0ec19bbe99cd7ebae185d1aad43129. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/QZWDD2565702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4b301c8d2fc01a14a6f50d8d981eab606757a1d72810cdcd0000ba5b858162f. 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/QZWDD2565681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48df3f960646e5b3d4b49dbd3de704f97fdf2376a9527e6645afeac8d6586826. 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/QZWDD2565684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x503a1539e1ce2eb55e19b821b8a4105d5ee3f097f3169c99dd2fbc99e22439b6. 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/QZZ8A2503885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ae3384a929d2cdd3d75bd8bc003ffb1bd4d225f4cabe4379bc4bc417852787f. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZZ8A2503895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39e50be692c77d9c211ac6e4849a7d87de8347346b46cc750531a671abee7cb3. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZZ8A2503935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8fed594f72f0ab08d9d26f3261455a2630f5be7bfdea3a9c1860d5c8b396725. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/QZZ8A2503999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd30167db26e44b7c348d46377a27a8b2e2ffdc2c67018195ab67fc8dae70ff50. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZZ8B2517421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a577982956f2cf8637b93ad1bc85fd68562a44c0cb194f867fcdc578d711281. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/QZZ8B2541627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ecccff7dd6862cb63dcc6af81a5ef8f55225d1ee80ed5812827fb31d1821664. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZZ8B2539301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48fa7da625d003ad3d6678067d7931594f2bc8b3c2ecf08c978b21a1e2c5026a. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZZ8B2541757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc26af96d4409543d6377b69b5f1229f65f5ca6f54205d02f38a6ef5eeddc4487. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/QZZ8B2541769.