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 0xfc668d7fb0914ae3824b51fb531e614dacd9b2ca1881c51fee5c9f81eb207f2f. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ef63d96a-d0cd-4dfc-be27-10f7759c9920.json and https://artists.proofprofile.net/proofs/artist/ef63d96a-d0cd-4dfc-be27-10f7759c9920.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The Itsy Bitsy Spider & More Children's Songs
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 0xf300d06dc084f928107c3ad7f86e62102696bfebd22abd176263632d78854d61. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZAKB2012579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcee5adb4d934f9a112b645c789e157eb31b36803dd10a68123ca15834ba0bdd. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZAKB2012580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e99e47ef3343c18bc792b1a57269cfce5df5a5b04c2918b335d8256d6698760. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZAKB2012581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54610ec7b57521a45b8bba318e7b0279101e88aeddd0cc90c1fc7b00987ac1ae. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZAKB2012582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd6ecefb098afdad8cfcb9c45dce3deb4260e3c1e77bd3c9ffd07e7aa2580b0d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZAKB2012583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69b1613399a4fffecbaa2fb2f628171dbf2de3b356d95acffb813f3d493cc4d3. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/QZAKB2012584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b0acaa9f4f02eb381fb0cb602317b1d7cb2f1018df397481ddf9fe93e2a0007. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QZAKB2012586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc15ace2de78f646e6ae2cb27a3364a7d0890c00c1ae81009cf44701d493a157c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZAKB2012587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c523f1fd4b1995b7d37cf546e8f1aed3cc09e3aa81ed4ec5039996f370fe8d2. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZAKB2012588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f83caaa8dd6a1631dd6b656c4886c69edad05d0eb86bf5820fe22e089e32ff6. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZAKB2012589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc78c6327a597011919119138a1ea19b117de6ef0fea0208c8776317ebdd7f390. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZAKB2012590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd422e6f6e9c8eb7dbd2cffbbe1cb00aa7a6599fdaa99d66303bfbc25e74c42bb. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZAKB2012591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51b90d1712b732a9b774fbc3f70894b4371136033629e116b85baf878b27a67f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZAKB2012592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3e9d1640ca5df7d05f93caed11f8bfe5c342cdb3f1b874cacf1d3a9540280e3. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZAKB2012593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1150a99e306f08e37de0b9e16abb2fc887bd75a68c5d3dd2b9086b75b5dba7a. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZAKB2012594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd93b86fd271b24ddf439f1eaa17606c958bd6174c6dbac0641add67fcda26e12. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZAKB2012595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7164d3ab932506ea8a98857b04c4bb7f4cc732767157d54d25b5dd626c0ed3fe. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZAKB2012596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65f684aee2a7f207eb67181e619922ea875702b56a1abbf058035be6360d0998. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZAKB2012597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55850e9c9866e7be00afe509472334aba6845fdedf02b8d6784a091b34548242. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZAKB2012598.