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 0xe0f57a42bd88437c0c6c4d84547c2a617d32a6f71b2984a020c6ff0aed8f0b14. 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/4fdacd0b-eeb5-46f9-ae30-072698038564.json and https://artists.proofprofile.net/proofs/artist/4fdacd0b-eeb5-46f9-ae30-072698038564.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 0x1c4cfe4dc1943d300c225c61ca86ce235c4d33911d8f6c015d15709fa7e1af5e. 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/QZGCD1801865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f48aece810751e605ec3ca517ded2ceaed10e31c9f16ff3db7dada03300d836. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/QZGCD1801869.
Chuyện Giàn Thiên Lý (Tình Khúc Anh Bằng và Trần Thiện Thanh)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x026b09535a72ad8724c279a58aff063c6dbfeebc33b290ec4b519202a2da87ca. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZGCD1801632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9162240e1a1fc312569c5434850b898c2b255b8685b2d3cf4fbfa82a48be8e1c. 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/QZGCD1801637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8c953f998059782395f32983fa71104bb793bc350b30ac67fdb1b0bbb48805b. 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/QZGCD1801638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0066edc85a1443cc1e44c83027b99215a826e5bc9dbfec065fbd2f336ae14be. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZGCD1801639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd5dddb3daeb9873dd927a4d355b498e2c34f84f0924e6cffe05f37b8d3937e4. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QZGCD1801663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5896761aaa95a8e1c3713d9fc88de7db49eec4eb9003529d0ecc94bfba83d9e1. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/QZGCD1801681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48b67edf9003c58840ca7f3bd0e512ff0f6a09ea83eb6f7535cdbccaa7cb651b. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZGCD1801684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89078d87dc29562e8b963c98681409e81570e0545dd15991e2b6bd00604a60cc. 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/QZGCD1801775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5763370e714d1deab087c75df01530e9641f3a29b80ad87fb96c28e7531b018. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/QZGCD1807384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e1bbe12221cbecfb13f76d51fa18aa4d671e58cddde5093ee8b271c50400c74. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZGCD1807234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4196ec14c7cb18fa9525d1fee5da0b27d55b392995e0dd98641eceb2828284ed. Chain 2 (Bitcoin): anchored in block 960339 (2026-07-31T03:13:37Z), 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/QZGCD1807245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc55336aadc3ebf21021d88b0f8d5d26873453cd03813d2dc6362cfc9ed2e966c. 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/QZGCD1800446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf628a2e48c9528d7b4a6b9765573dae7f0184f6325279a237d51e98940459ccf. 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/QZGCD1800448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14ae4aceb4b52aac8ee53baef0ce75c9988684f340c197c11c4ae0e65982caba. 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/QZGCD1800449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd05bc9028ee214d038dcf2cc39789de165f79e0a1ffbf79461ab09beb9613c60. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZGCD1807497.
Dạ Vũ Quốc tế 4: Thế giới Mùa Lễ hội (ASIA 64)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafccd2e4d13fd4c9ab3d5de02787a889fb74368efa7a538bb36c67ab1fa4b2ec. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZGCD1806246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1685c97d7a3c298bbc1f5218e3432915f88df1aee55bd9418ec8307ad2597e44. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/VNA0F2312075.