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 0x2cb870fab86a51058e65c5c09b8b5bef574ada36d28648ecea70dd5bf4b6ec3b. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4adb777c-c8f3-4f9b-b876-9dda6d38a3b1.json and https://artists.proofprofile.net/proofs/artist/4adb777c-c8f3-4f9b-b876-9dda6d38a3b1.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 0x46d8b66ed7db524cf60664bc2e1558a7ee0309a0bb47af877dabf251bfa5939b. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZTBC2325856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1590b3dae46723550324d22cc67c66da17b06172643f9885dfdfa1f80c1c9c4c. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/QZDA82002576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff562c054d39925f31aa09c45d22fdfb25a21be3f2cb59329d9a3657fcbdfecb. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZTBC2360411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe80153f24ae358b0595d112ced42365564e85d54fe0bee6d7319e07d84c2e18b. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/TCAJD2593859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfde8da886b812695a7a81dc128109b05ba441ec066ebb1c171554d0ca1b655dc. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/TCAJE2510141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcac1f123c9442ae8984e903a66db450b1b414956fd3fa2fe54ffeb5322862fde. 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/TCAJE2510157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe4365a4774629345515f9d5454be6212127a0f6073dbf616b1c2d8e0d05bf0f. 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/TCAJE2510191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48044d20f6b157606af64b8e38e3131256bfd70ce763b068d5c141221aa4c318. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/TCAJE2510218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd91b8186fc0764ecd0b30d48f0fbf72757fb510d247f1be01886ae02b3912129. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/TCAJE2510246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb72b651d33d394832cb078d2cd412f861f0d8491f3b647d6c12a89973235b3de. 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/TCAJF2563326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4cf1e92f94571087a202bb292e4ea1a07a9cf2388e65a4810f578f5b94bf629. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/TCAJF2563331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeabd0097c7e5d0943c2643c1feac3e1a15f8796cebd3250d4619010bfa5a3dc. 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/TCAJF2563338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0534f09a3fd1a3920ae46ba3d868f51f520b2a2e64f3f7bd5d323c280c3303e. 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/TCAJF2563343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57a997ede93f2d8a78aa2b21b0a4dbbb2c5808fc3a1bbdaaa1b012d1cdbd3237. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/TCAJF2563349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x914a0995821ee489973d5bdfdd2f9d7b46bd85ee51169ce93d771c49cdae8f74. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/TCAJF2563362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd713034392a2dc6546773079cab73afe36457e8c8c8470984633dc054240f546. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/TCAJF2563382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c58fc2d32dd6347b5b83fd2b4779193aed4c1f79553113f2b4ddfa401dd519f. 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/TCAJF2563392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f7f8af980880abc4eb1596c8ee9c7f5d282efd6151236ef8ed2a6a623efc270. 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/TCAJF2563411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1f4744fff19f730e25557d6fd57df7f5bc0589d312fdf02491cde4f11a88d60. 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/QZTB92526071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x114e4a2b0e5451234b1dcf53556fc77312cdfcf810e2901a5a4dd8935449fc78. 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/QZTB92526046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0071b462974c1aa54f716c41a4b03c13254f66a095db0d34f5134b9f23ce08c. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZTB92514496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x389090a9dd95a04f540c11db9940256b68ab347491f8acb8998aef048761ceb6. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZNWS2403232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7528361dbadd587e10f1410883e1a14b73a0b6b06d4960d1a8c22a98650880b0. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/QZTB92505385.