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 0x32b15ffbca195f05c12bbb359f5d036e55bac1911055985c14aa291f60d5c5d7. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a52b1130-e7c7-438f-88c7-28f5ad37ec41.json and https://artists.proofprofile.net/proofs/artist/a52b1130-e7c7-438f-88c7-28f5ad37ec41.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 0xe56b1a4553f2599b5ea5f2606cd91dd727d2c3aab0fdaa6d8cdc0b8469c9d15b. 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/QZZ7Q2554034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f9e13478edef7b2de052d8d9a3f31d8acd93143164db42e16a322f210dbb716. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QZZ7Q2554035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81187f3dbb60000385dc4980164d89c94b588a0d9e9b8a45e1801d7412513331. 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/QZZ7Q2554036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4caf53d5252453543ac5efd9b87ce8b36d7cccb59d176e65a0753a53e0de2996. 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/QZZ7Q2554037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8276481aef51d15c996fc19f2663a224d937122cdf66571ef6d3de26965c198. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/QZZ7Q2554038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe75adbb47ceb753d60a830a12281a99338e7bf749fb8948687045ea90faa1e79. 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/QZZ7Q2554039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34f2bc1d8b6aab56201733b86b2a313f332d774f88540ad4c24e1353bc0b5e97. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QZZ7Q2554040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7aa42f80e4b589e05b4104905aa1eedb0d0485a517fafef627605814d509498. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZZ7Q2554041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde5676a47dde4d61e14da1651706ff48820fa4ae1eb3717cf3616ee080245c5d. 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/QZZ7Q2554042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x994fabb2ae4fee151c5df3c27d9a6a2e01790dc16c3676ffde1f1bf19408983e. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QZZ7Q2554043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7387ca82601ca21a93b03a6f866e15b348f9e415ea2d538a6980b7ba6bb0493. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/QZZ7Q2554045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffb964b6486251ad899d635dd44958d28b69126a7004f19485a176307eed06ef. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QZZ7Q2554047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x228b8de1acc0737594068a2d3a1fb51df74d20800cd040a902e11ad166a524bd. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/QZZ7Q2554050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b6815d05e1bfc708b3d5b158e15953d18186a310a9398f639d6e544125013a1. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QZZ7Q2554055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4f83dd567562b5e53ef3aa66d09ef52eececc9a58fcda5634c59381104573bf. 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/QT3F22557621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7cd6d1b061b7586f9f4f55fa5cabcf793465137faacd83af001f14f8a4c2381. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/QT3F22557634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81fd16fc248b34618779aa147c157c324a3f5e06462105a54c531722631299e6. 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/QT3F62550302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18abe7ac430f91b04f50ec77b56f9f256dfd1b09a08284fe000f11c0e3e94e74. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QT3F62550303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf20180d8626cb27bc740d339abf53fc01b5f33a66114710721134f430c30c58c. 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/QT3F62550304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x488872bc5712329e4546d8ec62b04b80b0ac017c3ba3fe3d0d1a6f5e6f08222f. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/QT3F62550305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa912ee5992d3438bb6b550795b77064356e014ddd9a6e99c6b1cd403cc9930f3. 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/QT3F62550306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x444f63cecc3b8d80f6b5b0fa60cc752ff79312bd29087d4909357b251e98dd4f. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QT3F62550307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16a43036eee790a5e721db43c8d03c4965af19db21fa846718d53cb149961764. 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/QT3F62550308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf89f11c99199a583e870a68679e4a05048088ac9c25196a73ff77d9304ce693b. 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/QT3F62550309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ebde5424ede62ca9cfcd0a3e411a0598ecf2db2b8fdcb7a81d4c074a143d8b5. 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/QT3F62550310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa33bcc5d555749be5404a78df359309d0fc724a004bb9386834ae72dc83191c9. 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/QT3F62550311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1db1194722b3d732a3cfd26463b22a9d00293c0715c85e90c458b061bb220b60. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QT3F62550312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f373741a75edbbff2422fffb0f76ca631ee8778602ebaf07b01124000cccaa3. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T20:13:58Z), 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/QT3F62550313.