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 0x29ac88fb8a4d9b1ad852d5445e49f691e5d6160dd72359737183738843c78ed5. 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/4038420f-a71f-4635-a40b-f99fde82c16b.json and https://artists.proofprofile.net/proofs/artist/4038420f-a71f-4635-a40b-f99fde82c16b.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 0xb57b5737ef5e819dee508cefa34bbd894445959ffd071148397208db340229fe. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T18:42:32Z), 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/QZTBA2239528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb519a8091604b9a7a2b3eb2f0019003eaa3a77f82a319298aaa0cfbaab0ad14a. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/QZDA72346463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78ab50fcb1b3735e5032b9e6f2069a3de3dada532ac89fd1a3f0c9211497ede5. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZDA72346464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d0056bfd07a8bd0672f08f6fc9dd17ca9f161703771e6a6324290b3d1a35c06. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZDA72346466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde60f25fb89b356c55f8f1834a6c17582a82813a725f83e8babaefff131b701f. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZDA72346469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fbff3b765062f11fc10af60b3dda1b3705fa8c86d0a913e2b0599d535d2c3df. 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/QZDA72346470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9649c7e4220c3c16ed3d6ec253db9af991b35de9dc4cd576c85360075ca387ec. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:10:37Z), 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/QZDA72346473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x926a3dbcec784e755a282440c398fba347f7cafad6aa3d6b3463952a9509afbf. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T20:25:03Z), 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/HUA612303000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdab916df9edd802f88fc27aea95e9c4b17a29e8acdb621886f5b72694621c77. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/HUA612304486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2b3c9d2527c8c24e00b452e62cbd633ce4f0034b412f6d1f57413dfd5c1460d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/HUA612304487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f3d24c64fd5d72c5c4ee8fb2433bfd110eb48d712a816a8e8b4c363be136733. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/HUA612304488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bb1622a3c6731d66e04066334677d9f0707943896d1f213fbf148f206d7441a. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/HUA612304489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a62acf6b35c9cc961a133d0564982f1123a076a9c3096a3c02cb815a3f4b0f1. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/HUA612304490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12c38dacd6458ee5c4f230ef70e8e0088b478ae6f45d0f72ca8d328d4d5f8c8c. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/HUA612304492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb030039f765a285263badd4a6b61a8d0d40250d17ab594841f218b28d24768a. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:26:02Z), 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/HUA612304495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c89f1f72d9a387589590b9a4de20b4c5c0ca09abc89304cf0e39eca21e0f00b. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T22:48:51Z), 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/HUA612304496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fc5df0630b6f84354128b6a340e536442f6404527f721416683d17fe8fef3d8. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/HUA612304497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x593b13384654e69528c9625240bf67d85ac9685f639a5918b5b3d973504f2e96. 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/HUA612401926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02bf3ca1308698436d344730dc7f7118369b7ddf3fd5c15297153f8e352bf7a3. 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/HUA612403392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddcd0ee30c53c0a539d785b6c78653adee4ede91e9407840135f6eb82643629b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/HUA612403393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeacd36636b8ed535b19ba4db956083773137cfa0621ef63f7cfbc3600215718d. 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/HUA612403190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f1520fdac53e906894e48c7ebc8d401bc58f628b58d4786355167809189951a. 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/HUA612403394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedbf48e6cdbabd68f8657987d2cd8372ee93ce41a37b67da2550010127f7cf6f. 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/HUA612403395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70ffedf003caa80a3f330d51efa37f60decd7b44b0899f1816992c32ded04296. 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/HUA612403396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d672b09880366165b9695e50ab67a17bd9205514502a90e01598bea0f5caaf6. 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/HUA612401977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf7c33caa82da14dc82d4bef2c5708e50765c9144f03fceb1047ee079f124e8d. 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/ATR981332547.